To become a popular religion, it is only necessary for a superstition to enslave a philosophy.

Philosophy means thinking things out for oneself. Ultimately, there can be only one true philosophy, since reason is one and we all live in the same world.

The church is only a secular institution in which the half-educated speak to the half-converted.

They who will live for others shall have great troubles, but they shall seem to them small. Those who will live for themselves shall have small troubles, but they shall seem to them great.

Christianity promises to make men free; it never promises to make them independent.

The wise man is he who knows the relative value of things.

Deliberate cruelty to our defenceless and beautiful little cousins is surely one of the meanest and most detestable vices of which a human being can be guilty.