Logic is not satisfied with assertion. It cares nothing for the opinions of the great; nothing for the prejudices of the many, and least of all for the superstitions of the dead.

In all ages the people have honored those who dishonored them. They have worshiped their destroyers; they have canonized the most gigantic liars, and buried the great thieves in marble and gold. Under the loftiest monuments sleeps the dust of murder.

Christianity did not come with tidings of great joy, but with a message of eternal grief. It came with the threat of everlasting torture on its lips. It meant war on earth and perdition hereafter.

Reason, observation, and experience; the holy trinity of science.

All prayers die in the air which they uselessly agitate.

Surely there is grandeur in knowing that in the realm of thought, at least, you are without a chain; that you have the right to explore all heights and depth; that there are no walls nor fences, nor prohibited places, nor sacred corners in all the vast expanse of thought.

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.