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.

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

A wise man proportions his belief to the evidence.

Friends are companions on a journey who ought to help each other persevere on the road to a happier life.

-- Pythagoras

Life is an unfoldment, and the further we travel the more truth we can comprehend.

-- Hypatia

Imagine prisoners chained underground since childhood, seeing only shadows on a wall and taking them for reality.

-- Plato

Other dogs bite their enemies; I bite my friends — to save them.

-- Diogenes of Sinope

You are not a fish — how do you know the fish's pleasure?

-- Zhuang Zhou

The true is the whole.

-- Georg Wilhelm Friedrich Hegel