"Do nothing from selfish ambition or conceit, but in humility regard others as better than yourselves. Let each of you look not to your own interests, but to the interests of others. Let the same mind be in you that was^* in Christ Jesus." (Philippians 2:3-5)
Here is a video reflection of a man who took great strength from this passage:
http://www.youtube.com/watch?v=o0Q9CTzZ1Mk