In the following Scripture, Paul said he did not frustrate the grace of God.
Gal 2:21
21I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain. (KJV)
“Righteousness,” in the above verse, translates a Greek legal term and means “cleared of all guilt.” Furthermore, the words “righteousness, righteous, just, justify, justified and/or justification,” when used in your English Bible, are translations of the same Greek root above and still means, “cleared of all guilt.”
Frustrate means to make void. That is, Paul did not make void the grace of God. For him, Jesus blood took care of the guilt and penalty for all his sins or it did not. If it did, then they were taken away by the grace of God.
For Paul, to add any other thing would frustrate the grace of God. Likewise, for him, to take away any thing from the blood of Jesus would also frustrate the grace of God.
In other words, Paul was completely satisfied that the grace of God, utilizing the blood of Jesus, had completely dealt with the guilt and unworthiness he may have had because of his sins....