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.

Although I am not a polished speaker, I am certainly not lacking in knowledge. We have made this clear to you in every way possible.

and even if unlearned in word--yet not in knowledge, but in every thing we were made manifest in all things to you.

But if [I am] a simple person in speech, yet not in knowledge, but in everything making [the truth] manifest in all things to you.