logic Quotes

The advantage of the emotions is that they lead us astray.

In all matters of opinion, our adversaries are insane.

A man who does not think for himself does not think at all.

Fix reason firmly in her seat, and call to her tribunal every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blindfolded fear.

Reason and free inquiry are the only effectual agents against error.

The moment a person forms a theory, his imagination sees in every object only the traits which favor that theory.

Resort is had to ridicule only when reason is against us.

Errors of opinion may be tolerated where reason is left free to combat it.

Superstition is to religion what astrology is to astronomy the mad daughter of a wise mother. These daughters have too long dominated the earth.

Chance is a word void of sense; nothing can exist without a cause.