The avowed atheist and public entertainer Penn from Penn and Teller recounts an interaction with a Christian man who brought him a Bible. He asks some very good questions that we as Christians need to hear and, frankly, answer.
“How much do you have to hate someone to not proselytize? How much do you have to hate somebody to believe that everlasting life is possible and not tell them that?”
Along these lines this post might be helpful.
(ht: Mike A)