I am anxious to give away information, for it is only by giving it away that you can keep it. When you have told it, you remember it. It is with information as it is with liberty, the only way to be dead sure of it is to give it to other people.

Sacred are the lips from which has issued only truth.

My objection to Christianity is that it is infinitely cruel, infinitely selfish, and, I might add, infinitely absurd.

One thing I do know, and that is, that neither hope, nor fear, belief, nor denial, can change the fact. It is as it is, and it will be as it must be.

He who dishonors himself [by lying about his opinions] for the sake of being honored by others will find that two mistakes have been made - one by himself, and the other, by the people.

If we are immortal it is a fact in nature, and we are not indebted to priests for it, nor to bibles for it, and it cannot be destroyed by unbelief.

Epithets are not arguments. Abuse does not persuade.