Credulity is always ridiculous.

He who lives in the single exercise of his mental faculties, however usefully or curiously directed, is equally an imperfect animal with the man who knows only the exercise of muscles.

If we bring not the good courage of minds covetous of truth, and truth only, prepared to hear all things, and decide upon all things, according to evidence, we should do more wisely to sit down contented in ignorance, than to bestir ourselves only to reap disappointment.

Of the thousands who have paid homage to virtue, barely one has thought to inspect the pedestal on which it stands.

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

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

Moral truth, resting entirely upon the ascertained consequences of actions, supposes a process of observation and reasoning.