American Standard Version (ASV):
and we have sent with them our brother, whom we have many times proved earnest in many things, but now much more earnest, by reason of the great confidence which [he hath] in you.
King James Version (KJV):
And we have sent with them our brother, whom we have oftentimes proved diligent in many things, but now much more diligent, upon the great confidence which [I have] in you.