
It is not deducible from Scripture that the prospect of glorification was open to Adam prior to sinning, let alone that Adam was in a position to merit glorification. In fact, a reasonable inference is that covenant of life implies that Adam would have continued in a perpetual state of communion with God had he continued to obey God by faith. Unfortunately, in certain Reformed circles, the latter view is now considered aberrant. (Beale makes the best case I've seen for the prospect of glorification, though it remains an unnecessary inference.)
Let’s assume, however, that it was available to Adam to be glorified. To say that he might have merited glorification is most misleading. Would we say that a son who cuts his father’s half-acre field for fifty million dollars “earns the money”? In common parlance we might say “The son earned nothing. He merely received from a generous father that which was not deserved.” We can find even more problems with this novel view when we look more closely at the significant differences between the earthly son who receives a disproportionate reward for completing a task and the alleged prospect of glory that awaited Adam upon the successful completion of a supposed probation period.
1. The blessing of the world to come is of a different order than any blessing that can be obtained in this world, accentuating the folly of referring to the celestial blessing as one that could be earned by a creature. In other words, if it is equivocal to say that a son may “earn” fifty million dollars for cutting grass in less than two hours, how much more confusing is it to suggest that Adam was in a position to have “merited” being like Christ? In some respect it seems heretical.
2. When something is truly earned, it is understood that two parties benefit. The two parties, relative to each other, can be said to be autonomous. Indeed, the earthly father would receive some (although small) benefit from the son’s obedience; whereas God would have received no benefit from Adam’s obedience. Accordingly, it’s a misnomer to say that Adam, being contingent upon God, could have earned something from the hand of God. To suggest that Adam could have earned glory implies that God is wanting of something, like earthly fathers, and that would-be autonomous Adam could have fulfilled that need.
3. The earthly father would not have played a relevant part in causing the obedience of his son; whereas God would have providentially assured Adam’s obedience had Adam obeyed, accentuating the undeserved favor that Adam needed in order not to have fallen and to have remained a covenant-keeper. Therefore, it is misleading to say that Adam could have earned something from God when it would have been God who effectually enabled Adam gladly to do as he ought. To deny this is to affirm that Adam had libertarian freedom prior to the fall, a metaphysical surd indeed.
If one wants to say that Adam would have merited glorification, then it should be underscored that the compact would have been so exceedingly gracious that (a) the merited reward of being like Christ would have been incomprehensibly disproportionate to the work performed; (b) the benefactor of the reward would have received nothing of value in return for the work performed; and (c) the one who would have earned the reward would have done so only because the benefactor providentially caused the beneficiary gladly to will and to do of the benefactor’s good pleasure. Yet when we make all those qualifications, what then does it mean to say that Adam might have “merited” glorification?! Merit becomes a vacuous term!
So, why could the God-man have merited our glorification without contradicting the three points above?
1. By obedience, the Son received back the glory he already had known. (John 17:5) Accordingly, given who the Son is, the reward was not disproportionate, for he was even the one who created heaven.
2. Even when we “glorify” God, we are not bringing glory to him per se, but rather a magnanimous God is showing forth his glory in us. Accordingly, strictly speaking, Adam himself was not, nor could he have been, in position to glorify God. Therefore, Adam was not in a position to earn anything from God. Yet Adam was in a position but by no worthiness of his own (of course), to show forth God’s glory but only by God’s determination and grace.
The Father, however, did receive something through the Son’s work on behalf of his people. The Father was truly glorified through the glorification of the Son. (John 17:1) The difference is that the Father was glorified through the work of the Son that was performed not only for, through and to God but, also, by him in the person of Christ. God being a non-contingent sovereign being can receive glory through who he is and what he’s done.
3. The Son being the creator and sustainer of all things was the source of his own willing and doing of his Father’s good pleasure, unlike created beings – even those created upright.
With respect to the claim of glorification upon perfect obedience:
It is with hesitance I dignify the notion that Adam could have merited anything before God. For one reason the idea presupposes the inference that it was available to Adam to enter into glory, whether by grace or merit.
Here is a rough argument for the meritorious view:
p1. Jesus after a finite amount of time on earth entered into glory
p2. The compact with Adam paralleled that of Jesus with respect to the hope of glory
C. Adam after a finite amount of time on earth would have entered into glory
The minor premise needs to be shown from Scripture, not just assumed. Given the implied parallel in p2, why not also assume a parallel with respect to the possibility of sin? Why, in other words, should we not conclude that Jesus could have sinned given that Adam could, if it were indeed true that Adam could have obtained glory just as Christ could? (I address Hodge’s argument here: http://reformedapologist.blogspot.com/2006/09/could-jesus-have-sinned.html) Also, given the parallel in p2, why not also assume that Adam would have obtained eternal life for those he represented, as did Jesus? (G.K. Beale in his N.T. Biblical Theology offers the most persuasive exegetical case I've seen for p2; yet it remains an inference that although is "good" is not "necessary" but to make it dogma is to exceed the principle of Sola Scriptura.)
The response I have received in the past is much along the lines of: “God promises ‘eternal life’ to those who perfectly fulfill its precepts (Lev. 18:5; Matt. 19:16-7; Rom. 10:5; Gal. 3:12; etc.)”The problem with such a line of reasoning is that none of the proof-texts imply that Adam (or any other non-divine person) would have been glorified by keeping the law. Life is indeed a sufficient condition for the guarantee of future glorification in the days of redemption, but we know that by divine revelation - not speculation! With respect to Adam we have no such revelation. In fact, all we know is that the life Adam enjoyed was not a sufficient condition for glorification since he indeed fell! Under the gospel we have a golden chain of redemption, which culminates in the glorified state. In the garden there was no golden chain of redemption but rather life was offered upon perpetual obedience. As long as Adam would obey, he’d live. Adam had life (even life eternal in some respect) until he would fall. Eternity is not timeless; so Adam was (in time) a partaker of eternal life, just as believers are now. [Note: The ontology of Adam and that of one born from above are of course different but the point still stands.] If Adam had obeyed forever, he would have continue to live eternally. The merit advocate’s task is to prove that Adam, after a time, would have lived forever in a different, glorified state. Yet all that Scripture reveals is that glorification is an additional blessing to our new life, having been raised in Christ. I want to see where Scripture reveals that glorification was offered as an increase in blessing upon Adam’s perfect obedience apart from union with Christ, the God-man.
What a great salvation we have in Christ! We have more than was ever available to Adam, which has teleological implications that I would think pertain to supra-infra discussions. It would seem, in other words, that the prospect of glory for Adam is critical to a infralapsarian position. (The supra position as it has been traditionally formed (Beza) is problematic to me as well. Yet in later times supras such as Clark and Reymond placed in the first position the election of some sinful men unto salvation, which I find closer to the telos that Scripture puts forth. Finally, given a multi-faceted decree in which some ends are means to other ends, it's somewhat a fools game to try speculate the teleological order of it. I think Frame hints at this notion with softer words in DKG.)

Let’s assume, however, that it was available to Adam to be glorified. To say that he might have merited glorification is most misleading. Would we say that a son who cuts his father’s half-acre field for fifty million dollars “earns the money”? In common parlance we might say “The son earned nothing. He merely received from a generous father that which was not deserved.” We can find even more problems with this novel view when we look more closely at the significant differences between the earthly son who receives a disproportionate reward for completing a task and the alleged prospect of glory that awaited Adam upon the successful completion of a supposed probation period.
1. The blessing of the world to come is of a different order than any blessing that can be obtained in this world, accentuating the folly of referring to the celestial blessing as one that could be earned by a creature. In other words, if it is equivocal to say that a son may “earn” fifty million dollars for cutting grass in less than two hours, how much more confusing is it to suggest that Adam was in a position to have “merited” being like Christ? In some respect it seems heretical.
2. When something is truly earned, it is understood that two parties benefit. The two parties, relative to each other, can be said to be autonomous. Indeed, the earthly father would receive some (although small) benefit from the son’s obedience; whereas God would have received no benefit from Adam’s obedience. Accordingly, it’s a misnomer to say that Adam, being contingent upon God, could have earned something from the hand of God. To suggest that Adam could have earned glory implies that God is wanting of something, like earthly fathers, and that would-be autonomous Adam could have fulfilled that need.
3. The earthly father would not have played a relevant part in causing the obedience of his son; whereas God would have providentially assured Adam’s obedience had Adam obeyed, accentuating the undeserved favor that Adam needed in order not to have fallen and to have remained a covenant-keeper. Therefore, it is misleading to say that Adam could have earned something from God when it would have been God who effectually enabled Adam gladly to do as he ought. To deny this is to affirm that Adam had libertarian freedom prior to the fall, a metaphysical surd indeed.
If one wants to say that Adam would have merited glorification, then it should be underscored that the compact would have been so exceedingly gracious that (a) the merited reward of being like Christ would have been incomprehensibly disproportionate to the work performed; (b) the benefactor of the reward would have received nothing of value in return for the work performed; and (c) the one who would have earned the reward would have done so only because the benefactor providentially caused the beneficiary gladly to will and to do of the benefactor’s good pleasure. Yet when we make all those qualifications, what then does it mean to say that Adam might have “merited” glorification?! Merit becomes a vacuous term!
So, why could the God-man have merited our glorification without contradicting the three points above?
1. By obedience, the Son received back the glory he already had known. (John 17:5) Accordingly, given who the Son is, the reward was not disproportionate, for he was even the one who created heaven.
2. Even when we “glorify” God, we are not bringing glory to him per se, but rather a magnanimous God is showing forth his glory in us. Accordingly, strictly speaking, Adam himself was not, nor could he have been, in position to glorify God. Therefore, Adam was not in a position to earn anything from God. Yet Adam was in a position but by no worthiness of his own (of course), to show forth God’s glory but only by God’s determination and grace.
The Father, however, did receive something through the Son’s work on behalf of his people. The Father was truly glorified through the glorification of the Son. (John 17:1) The difference is that the Father was glorified through the work of the Son that was performed not only for, through and to God but, also, by him in the person of Christ. God being a non-contingent sovereign being can receive glory through who he is and what he’s done.
3. The Son being the creator and sustainer of all things was the source of his own willing and doing of his Father’s good pleasure, unlike created beings – even those created upright.
With respect to the claim of glorification upon perfect obedience:
It is with hesitance I dignify the notion that Adam could have merited anything before God. For one reason the idea presupposes the inference that it was available to Adam to enter into glory, whether by grace or merit.
Here is a rough argument for the meritorious view:
p1. Jesus after a finite amount of time on earth entered into glory
p2. The compact with Adam paralleled that of Jesus with respect to the hope of glory
C. Adam after a finite amount of time on earth would have entered into glory
The minor premise needs to be shown from Scripture, not just assumed. Given the implied parallel in p2, why not also assume a parallel with respect to the possibility of sin? Why, in other words, should we not conclude that Jesus could have sinned given that Adam could, if it were indeed true that Adam could have obtained glory just as Christ could? (I address Hodge’s argument here: http://reformedapologist.blogspot.com/2006/09/could-jesus-have-sinned.html) Also, given the parallel in p2, why not also assume that Adam would have obtained eternal life for those he represented, as did Jesus? (G.K. Beale in his N.T. Biblical Theology offers the most persuasive exegetical case I've seen for p2; yet it remains an inference that although is "good" is not "necessary" but to make it dogma is to exceed the principle of Sola Scriptura.)
The response I have received in the past is much along the lines of: “God promises ‘eternal life’ to those who perfectly fulfill its precepts (Lev. 18:5; Matt. 19:16-7; Rom. 10:5; Gal. 3:12; etc.)”The problem with such a line of reasoning is that none of the proof-texts imply that Adam (or any other non-divine person) would have been glorified by keeping the law. Life is indeed a sufficient condition for the guarantee of future glorification in the days of redemption, but we know that by divine revelation - not speculation! With respect to Adam we have no such revelation. In fact, all we know is that the life Adam enjoyed was not a sufficient condition for glorification since he indeed fell! Under the gospel we have a golden chain of redemption, which culminates in the glorified state. In the garden there was no golden chain of redemption but rather life was offered upon perpetual obedience. As long as Adam would obey, he’d live. Adam had life (even life eternal in some respect) until he would fall. Eternity is not timeless; so Adam was (in time) a partaker of eternal life, just as believers are now. [Note: The ontology of Adam and that of one born from above are of course different but the point still stands.] If Adam had obeyed forever, he would have continue to live eternally. The merit advocate’s task is to prove that Adam, after a time, would have lived forever in a different, glorified state. Yet all that Scripture reveals is that glorification is an additional blessing to our new life, having been raised in Christ. I want to see where Scripture reveals that glorification was offered as an increase in blessing upon Adam’s perfect obedience apart from union with Christ, the God-man.
What a great salvation we have in Christ! We have more than was ever available to Adam, which has teleological implications that I would think pertain to supra-infra discussions. It would seem, in other words, that the prospect of glory for Adam is critical to a infralapsarian position. (The supra position as it has been traditionally formed (Beza) is problematic to me as well. Yet in later times supras such as Clark and Reymond placed in the first position the election of some sinful men unto salvation, which I find closer to the telos that Scripture puts forth. Finally, given a multi-faceted decree in which some ends are means to other ends, it's somewhat a fools game to try speculate the teleological order of it. I think Frame hints at this notion with softer words in DKG.)