If there is anything in the world which I do firmly believe in, it is the universal validity of the law of causation.

The Bible account of the creation of Eve is a preposterous fable.

Whatever part of the animal fabric whatever series of muscles, whatever viscera might be selected for comparison the result would be the same the lower Apes and the Gorilla would differ more than the Gorilla and the Man.

Whatever evil voices may rage, Science, secure among the powers that are eternal, will do her work and be blessed.

In matters of the intellect, do not pretend that conclusions are certain which are not demonstrated or demonstrable. That I take to be the agnostic faith, which if a man keep whole and undefiled, he shall not be ashamed to look the universe in the face, whatever the future may have in store for him.

Economy does not lie in sparing money, but in spending it wisely.

Better live a crossing-sweeper than die and be made to talk twaddle by a "medium" hired at a guinea a seance.