. . . .frustrate the grace of God?
As used by Paul in Galatians; to frustrate the Grace of God is similar to when someone has done, or wants to do something FOR us, and we right off reject it with "no, thanks, I can do it myself."
This is Paul's "I do not frustrate the Grace of God:" [in what sense, Paul; how so?] "for if righteousness cometh by the law, then Christ is dead in vain" Gal. 2:21
Paul continues his intended sense in the next chapter.
Galatians 3:
1. O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?
2. This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?
3. Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?
4. Have ye suffered so many things in vain? if it be yet in vain.
5. He therefore that ministereth to you the Spirit, and worketh miracles among you, doeth he it by the works of the law, or by the hearing of faith?
6. Even as Abraham believed God, and it was accounted to him for righteousness.
Lol, as has often been your pattern on here, now if you "already knew that" but then allow the fleshly mind's focus to reign; to lead you to view this post as directed at you in some derogatory way, then that too would constitute frustrating the Grace of God - for His "Grace teaches us" that His "Grace is made perfect in weakness...before men..."
Of course, this "bite and devour one another" that rejecting the opportunity to apply God's Grace during the flesh's fool temptations, is also dealt with in Galatians.
Thanks for the privilege of thinking these things through once more that your above question has resulted in.
Derogatories, whether only perceived to be the case, or whether they actually are, nevertheless, His Grace is indeed sufficient!