Charles Ellicott Commentary 2 Corinthians 6:1

"And working together [with him] we entreat also that ye receive not the grace of God in vain" — 2 Corinthians 6:1 (ASV)

We then, as workers together with him, beseech you . . .—The thought of the marvel of the atoning love fills St. Paul’s heart with an almost passionate desire to see its purpose realized in those he has taught.

And so, he renews his plea as a “fellow-worker with Him.” The pronoun “Him” in this phrase could grammatically refer to either God or Christ. However, the general tone of the context and St. Paul’s language elsewhere (1 Corinthians 12:6; Ephesians 1:11; Ephesians 1:20; Philippians 2:13) are decisive in favor of the former—that is, God.

The language he uses is significant in every way. Those to whom he wrote had believed and been baptized, and so they had “received the grace.”

However, the freedom of the will to choose good or evil remained. If they chose evil, they would frustrate the purpose that the grace was intended to accomplish. (Compare the language of 1 Corinthians 9:27; 1 Corinthians 15:10).