[Responding to the question why he was not a member of any specific religion:]
Because they all appear to have prohibitions, admonitions and proffered truths which cannot be established as a matter of intellect or natural law, which is reason -- simple reason -- unattended by revelation of faith. Most of them insist that you believe in certain things not because you can prove absolutely that they are so, but because you want to believe in them. Give me a church or a religion that has one principle: Love one another as you love yourself, and I will belong to that church.
-- Abraham Lincoln