Whoever increases the sum of human joy, is a worshiper. He who adds to the sum of human misery, is a blasphemer.

Only a few years ago there was no person too ignorant to successfully answer Charles Darwin; and the more ignorant he was the more cheerfully he undertook the task.

Grant others the same rights as you claim for yourself.

In the search for truth - that everything in nature seems to hide - man needs the assistance of all his faculties. All the senses should be awake.

Blasphemy is an epithet bestowed by superstition upon common sense.

The present is the necessary product of all the past, the necessary cause of all the future.

If we are immortal, it is a fact of nature, and that fact does not depend on bibles, on Christs, priest, or creeds.