1 Corinthians 9:22 To the weak I became weak, to win the weak. I have become all things to all people so that by all possible means I might save some. 

Befriending sinners is part of what we are called to do. Even when we give all of ourselves to help win others for Christ, some will not believe. May I be encouraged by those who do believe because of the work God enables me to do in the lives of others.