But I trust that ye shall know that we are not reprobates.
We are not reprobates - not unable to abide the "proof." "I trust that" your own Christianity will be known by you on your proving it ("yes shall know," answers to "know ... your own selves," 2 Corinthians 13:5) as "proof" that we are not reprobates, but that 'Christ speaks in me,' without needing a proof from me more trying to yourselves. If ye know your own Christianity, ye will not doubt my apostleship, for ye are the fruits of my apostleship.