2 Timothy 2:23-26 (NIV)
23 Don’t have anything to do with foolish and stupid arguments, because you know they produce quarrels. 24 And the Lord’s servant must not be quarrelsome but must be kind to everyone, able to teach, not resentful. 25 Opponents must be gently instructed, in the hope that God will grant them repentance leading them to a knowledge of the truth, 26 and that they will come to their senses and escape from the trap of the devil, who has taken them captive to do his will.
Matthew 5:43-46  (NIV)
43 “You have heard that it was said, ‘Love your neighbor and hate your enemy.’ 44 But I tell you, love your enemies and pray for those who persecute you, 45 that you may be children of your Father in heaven. He causes his sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. 46 If you love those who love you, what reward will you get? Are not even the tax collectors doing that?