There is no significant idea which cannot be explained to an intelligent twelve year old boy in fifteen minutes.

The true meaning of Christ's teaching consists in the recognition of love as the supreme law of life, and therefore not admitting any exceptions.

From the self-confidence with which he spoke no one could tell whether what he said was very clever or very stupid.

Some mathematician, I believe, has said that true pleasure lies not in the discovery of truth, but in the search for it.

The teaching of the church, theoretically astute, is a lie in practice and a compound of vulgar superstitions and sorcery.

Slavery, you know, is nothing else than the unwilling labor of many. Therefore to get rid of slavery it is necessary that people should not wish to profit by the forced labor of others and should consider it a sin and a shame. But they go and abolish the external form of slavery and arrange so that one can no longer buy and sell slaves, and they imagine and assure themselves that slavery no longer exists, and do not see or wish to see that it does, because people still want and consider it good and right to exploit the labor of others.

Man must not check his reason by tradition, but, contrariwise, must check tradition by reason.