Render unto Casear what is Caesar's and render unto God what is God's.
Also,
Mark 9:38-40 "...we saw one casting out devils in thy name, and he followeth not us: and we forbade him, because he followeth not us. But Jesus said, Forbid him not: for there is no man which shall do a miracle in my name, that can lightly speak evil of me. For he that is not against us is on our part." (KJV)
Luke 9:49-50 "...we saw one casting out devils in thy name; and we forbade him, because he followeth not with us. And Jesus said unto him, Forbid him not: for he that is not against us is for us."
Bush for example could learn from that with his "You are either with us or against us." i.e. the world is Black and white. No, Jesus said if you are not against us you are for us.
When Jesus was rejected by a village, his disciples told him to destroy the village with a curse,
Luke 9:52-56: "...they did not receive him...And when his disciples James and John saw this, they said, Lord, wilt thou that we command fire to come down from heaven, and consume them, even as Elias did? But he turned, and rebuked them, and said, Ye know not what manner of spirit ye are of. For the Son of man is not come to destroy men's lives, but to save them. And they went to another village."