Charles Ellicott Commentary 2 Corinthians 1:19

"For the Son of God, Jesus Christ, who was preached among you by us, [even] by me and Silvanus and Timothy, was not yea and nay, but in him is yea." — 2 Corinthians 1:19 (ASV)

By me and Silvanus and Timotheus.—We note an undesigned coincidence with Acts 18:5, where Silas (whose identity with Silvanus is thus proved) is said to have come with Timotheus to join St. Paul at Corinth. The three names are joined together in the same order in 1 Thessalonians 1:1, and 2 Thessalonians 1:1.

Was not yea and nay, but in him was yea.—From the forensic point of view, this was, of course, hardly an adequate defence against the charge of inconsistency. The argument was, so to speak, one of ethical congruity. It was infinitely unlikely that one who preached Christ, the absolutely True Christ, who enforced every precept with the emphatic Amen, Amen (the word occurs thirty-one times in Matthew, fourteen times in Mark, seven times in Luke, and in its reduplicated form twenty-five times in John), Verily, verily, should afterwards be shamelessly untruthful, and use words with a deceptive double meaning.

But in him was yea.—Better, but in him Yea has been and still is so, as His great characterising word.