I don't pretend we have all the answers. But the questions are certainly worth thinking about.

A man of knowledge lives by acting, not by thinking about acting.

Formula for success: rise early, work hard, strike oil.

I have never in my life learned anything from any man who agreed with me.

Cherish that which is within you, and shut off that which is without; for much knowledge is a curse.

It is one of my sources of happiness never to desire a knowledge of other people's business.

But inner experience is only one source of human knowledge.

Every addition to true knowledge is an addition to human power.

There are no shortcuts in evolution.

Knowledge is like money: to be of value it must circulate, and in circulating it can increase in quantity and, hopefully, in value.