1 Thessalonians 2:10 - Matthew Poole's English Annotations on the Holy Bible

The former verses gave account of their carriage in the ministry, this here of their Christian conversation; holily, with respect to God; justly, with respect to duties commanded towards men; and unblamably, in denying themselves in lawful liberty to avoid all occasion of blame from any of them. And for the truth of this he appeals to themselves; yea, to God himself. There is the witness of men, and the witness of conscience greater than of men, and the witness of God greatest of all, 1 John 3:20. He appeals to them as witnesses about their external actions, and to God about the integrity of their hearts; and he doth this not in a way of boasting, but to be an example to them, and as a further reason of the great success of his ministry. The conversation of ministers hath great influence upon the success of their labours.