Albert Barnes on Philemon 1:21

Having confidence in thy obedience. That you would comply with all my expressed desires.

I wrote unto thee. "I have written to you;" to wit, in this epistle.

Knowing that thou wilt also do more than I say. In all the respects which he had mentioned--in receiving Onesimus, and in his kind treatment of him. He had asked a great favour of him, but he knew that he would go even beyond what he had asked.

(b) "confidence" 2Cor 7:16 (+) "obedience" "compliance"