What were the glories of the sun, if we knew not the gloom of darkness?

Truth is but approved facts.

... 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.

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

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.

Credulity is always ridiculous.

It is in vain that we would circumscribe the power of one half of our race, and that half by far the most important and influential.