PSA theorists often give the example of you standing before a judge and another taking your sentence.
You murdered a child. You are guilty. But Jesus stands before the Judge as the sentence of death is passed and on your behalf takes that punishment for you. Justice does not care who is punished as long as the deficiency in the law is paid. So you, the murderer, is released and an innocent person is killed in your place. Justice is served.
If such is how PSA is illustrated, I believe this is where PSA comes up short.
Not just anyone could stand up and take your place. Even if such were actually guiltless. The one standing up to take your place has to be the OFFENDED PARTY (which is God). Justice is demanded and the verdict is read -
The wages of sin is death.... Rom 6:23a
The debt is owed by man. Adam (our Federal head) is the offender.
As in Adam, all die... 1 Cor 15:22a
Christ, the "Second Adam" had to become a man (and is, in fact TRULY MAN - V
era Homo) because the sin debt was owed by man and therefore only man could pay this debt. In order to pay this debt on our behalf, Christ had to present himself as the SPOTLESS LAMB who fulfilled the righteousness of the law perfectly as this is God's standard for righteousness.
Our sin is infinite in quantity because we have sinned against a holy and infinite God, it requires an infinite, eternal punishment in the lake of fire. No mere mortal man regardless of their righteous standing was able to pay such a debt! The only one capable of paying such an infinite debt is an infinite being and the only infinite being who exists (and is therefore eligible) is God!
He (God) hath made him (Jesus) to be sin for us (took our sin) who knew no sin (was perfectly righteous) so that we (a sinner) might be made the righteousness of God (declared righteous) in him - 2 Cor 5:21.
Therefore,
the gift of God is eternal life through Jesus Christ (Rom 6:23b) and
in Christ, all shall be made alive (1 Cor 15:22b).
In other words, the offended party (God) relinquished his right to justice and through Jesus Christ, the son of the living God (
Vera Deus) justice prevailed and he rose victorious and because of this, we may stand before him as we stand before him, we will see the nail prints of the one who suffered on our behalf!
I don't know about you but I think I would like to worship this God right about now!
Standing before him on that blissful day, Faith is no more I shall see face-to-face
In all glory and splendor, lost in his wonder and grace!
As I behold him I may understand, His sword pierced side and his nail scarred hand
Bear the cost of redemption, so that before him I'd stand
No condemnation I ever shall fear, you'll wipe away all my sorrow and tears
And in your presence I'll ever draw near and proclaim, praise your name,
My sins are gone!