Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them.

A wise man proportions his belief to the evidence.

Truth springs from argument amongst friends.

One swallow does not make a spring.

-- Aristotle

Let us then suppose the mind to be, as we say, white paper, void of all characters, without any ideas; how comes it to be furnished? ... To this I answer, in one word, from experience.

-- John Locke

Nothing is in the intellect that was not first in the senses.

-- Thomas Aquinas

Early to bed and early to rise, makes a man healthy, wealthy, and wise.

-- Benjamin Franklin

Spend each day trying to be a little wiser than you were when you woke up.

-- Charlie Munger

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

-- Avicenna