Every man should be mentally honest. He should preserve as his most precious jewel the perfect veracity of his soul. He should examine all questions presented to his mind, without prejudice, - unbiased by hatred or love - by desire or fear. His object and his only object should be to find the truth. He knows, if he listens to reason, that truth is not dangerous and that error is. He should weigh the evidence, the arguments, in honest scales - scales that passion or interest cannot change. He should care nothing for authority - nothing for names, customs or creeds - nothing for anything that his reason does not say is true.

Every man is dishonest who lives upon the labor of others, no matter if he occupies a throne.

Everything in nature tells a different story to all eyes that see and to all ears that hear. So, when we look upon a flower, a painting, a statue, a star, or a…

Every library is an arsenal.

In our reasonings concerning matter of fact, there are all imaginable degrees of assurance, from the highest certainty to the lowest species of moral evidence.…

Scientific beliefs are supported by evidence, and they get results. Myths and faiths are not and do not.

Agnosticism is not properly described as a 'negative' creed, nor indeed as a creed of any kind, except in so far as it expresses absolute faith in the validity…