Custom, then, is the great guide of human life.

Truth springs from argument amongst friends.

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.

You must learn all things: both the steadfast heart of well-rounded Truth and the opinions of mortals, in which there is no true trust.

-- Parmenides

For thinking and Being are the same.

-- Parmenides

Those who understand that things arise dependently know them to be empty.

-- Nagarjuna

Knowing is the beginning of action; action is the completion of knowing.

-- Wang Yangming

The world is my representation.

-- Arthur Schopenhauer

Knowledge is the conformity of the object and the intellect.

-- Averroes