The wise are instructed by reason, average minds by experience, the stupid by necessity and the brute by instinct.

Wise men are instructed by reason; men of less understanding, by experience; the most ignorant, by necessity; the beasts, by nature.

Reason is the mistress and queen of all things. [Lat., Domina omnium et regina ratio.]

Reason should direct and appetite obey

He only employs his passion who can make no use of his reason

Nature has planted in our minds an insatiable longing to see the truth.