We all know people believe in the Penal Substitution Theory of Atonement while others reject it.Jesus died a violent, substitutionary death to be a sacrifice of atonement for the sins of Jews and Gentiles. by this death, Jesus took upon himself God's righteous judgment and wrath against the sins of those for whom he died. By dying as their penal substitute, Jesus paid the penalty for their sins, and he therefore both propitiated God's wrath against their sins and expiated their sins so that the sins of the Jews and Gentiles would be forgiven and so that they would be justified by faith, forgiven of their sins, reconciled to God, reconciled to each other, participate in the future resurrection and saved from God's wrath. [An extract from Jarvis J. Williams, from his essay Violent Atonement : The Foundation Of Paul's Soteriology In Romans.]
I am not sure exactly why you and @Piper always bring up Penal Substitution theorists as proof that the theory is correct. It doesn't make sense.
If you want to prove the Penal Substitution Theory correct then you need to provide Scripture saying that God was punishing Jesus instead of us, that Jesus died under God's wrath, and the like.
But you can't, so you point to men who held or holds the Theory as "proof".
That is why @Piper and @Martin Marprelate get on the tangent about people who have been carried away by philosophy (like Boyd).
Nobody here pointed to those men as examples of truth.
I even stated that Boyd is carried away by philosophy. Just like Penal Substitution theorists have been mislead by vain philosophy.
The proof is here on the BB. Those of us arguing against the Penal Substitution Theory of Atonement rely on Scripture (on what is written in God's Word). You, @Piper , and @Martin Marprelate have constantly relied on men who hold the Penal Substitution Theory of Atonement to prove the theory correct.
Your standard is too subjective to be considered legitimate.