There is but one honest limit to the rights of a sentient being; it is where they touch the rights of another sentient being.

How are men to be secured in any rights without instruction; how to be secured in the equal exercise of those rights without equality of instruction? By instruction understand me to mean knowledge - just knowledge; not talent, not genius, not inventive mental powers.

... the yearly expenses of the existing religious systemexceed in these United States twenty millions of dollars. Twenty millions! For teaching what? Things unseen and causes unknown!... Twenty millions would more than suffice to make us wise; and alas! do they not more than suffice to make us foolish?

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

Truth is but approved facts.

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.

You have heard of, and studied various systems of philosophy; but real philosophy is opposed to all systems.