2 Corinthians 11:6

But though I be rude in speech, yet am I not in knowledge; nay, in every way have we made this manifest unto you in all things. [Paul admits that one criticism of him was true. He did indeed pay little regard to the laws of rhetoric, and scorned to weaken his thought by loading it with verbal ornament or the studied expressions which the schools regarded as eloquence. But though he was thus rude in speech, a very unimportant matter, he was not deficient in the all-important sphere of knowledge. The Corinthians had had every opportunity to test him in this particular, and he felt that the truth of his statement must be so manifest to them as to need no further proof.]