All the wisdom of the world is not to be found in one little academic department.

The unexamined life is not worth living.

It is only ideas gained from walking that have any worth.

Talent hits a target no one else can hit; Genius hits a target no one else can see.

A genius is not just answering questions but asking questions that nobody else thought to ask.

Give me six hours to chop down a tree and I will spend the first four hours sharpening the axe.

No one can defeat a powerful mind.

Life is never made unbearable by circumstances, but only by lack of meaning and purpose.