The best road to correct reasoning is by physical science; the way to trace effects to causes is through physical science; the only corrective, therefore, of superstition is physical science.

Trust me, there are as many ways of living as there are men, and one is no more fit to lead another, than a bird to lead a fish, or a fish a quadruped.

I am neither Jew nor Gentile, Mohammedan nor Theist; I am but a member of the human family, and would accept of truth by whomsoever offered -- that truth which we can all find, if we will but seek in things, not in words; in nature, not in human imagination; in our own hearts, not in temples made with hands.

Equality is the soul of liberty; there is, in fact, no liberty without it.

Truth is but approved facts.

Religion may be defined thus: a belief in, and homage rendered to, existences unseen and causes unknown.

Credulity is always ridiculous.