The following are qoutes I have found that are very meaningful to me. If I know the source I have included it, on most I don't.
"Humanity's first sin was faith; the first virtue was doubt."
"At eighty, I think what I shall regret are the things I always wanted to do and never did; the experiences I denied myself because I was too concerned about others' opinions, or too anxious for their approval; but I think I would regret most a life wasted living as someone who was not me.."
"If anyone can show me, and prove to me, that I am wrong in thought or deed, I will gladly change. I seek the truth, which never yet hurt anybody. It is only persistence in self-delusion and ignorance which does harm." --Marcus Aurelius
"There once was a time when all people beleived in God and the church ruled. This time was called the Dark Ages." --Richard Lederer