... your spiritual teachers caution you against enquiry--tell you not to read certain books; not to listen to certain people; to beware of profane learning; to submit your reason, and to receive their doctrines for truths. Such advice renders them suspicious counsellors.

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.

Many are called impious, not for having a worse, but a different religion from their neighbors; and many atheistical, not for the denying of God, but for thinking somewhat peculiarly concerning him.

Do not confound noise with fame. The man who is remembered, is not always honored.

I am neither Jew nor Gentile, Mahomedan nor Theist; I am but a member of the human family.

No man can see his own prejudices.

Equality! Where is it, if not in education? Equal rights! They cannot exist without equality of instruction.