Philemon - Jason

I appeal to you for my child, Onesimus, whose father I became in my imprisonment. (Formerly he was useless to you, but now he is indeed useful to you and to me.) I am sending him back to you, sending my very heart. (Phil. 1:10-12)

I think it's cool that Paul was asking Philemon to accept fellowship with a young man who was at one time not useful as a minister of God's work, but then he was changed by God and cleansed to become useful again for ministry.