Aristotle

The heart is the source of heat and the seat of life and sensation.

The brain is an organ of minor importance, perhaps necessary to cool the blood.

For the sake of life, animals have sensation; for the sake of the good life, they have intelligence.

The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.

The final cause, then, produces motion by being loved.

The actuality of thought is life.

The virtue of a man will be the state of character which makes a man good and which makes him do his own work well.

The wise man seeks absence of pain, not pleasure.

The worst form of government is that which is the government of the many for the sake of the few.

The secret to humor is surprise.