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- Let our reason, and not our senses, be the rule of our conduct; for reason will teach us to think wisely, to speak prudently, and to behave worthily.
- Though reason is not to be relied upon as universally sufficient to direct us what to do, yet it is generally to be relied upon and obeyed where it tells us what we are not to do.
- Wise men are instructed by reason; men of less understanding, by experience; the most ignorant, by necessity; and beasts, by nature.
- When a man has not a good reason for doing a thing, he has one good reason for letting it alone.
- One can never repeat too often, that reason, as it exists in man, is only our intellectual eye, and that, like the eye, to see, it needs light,—to see clearly and far, it needs the light of evidence.
- There is a just Latin axiom, that he who seeks a reason for everything subverts reason.