You never know what is enough unless you know more than enough.

He who replies to words of doubt
doth put the light of knowledge out.

To my knowledge, we have never supported a project in Phoenix that was not ultimately approved to the satisfaction of the Federal Aviation Administration.

The true method of knowledge is experiment.

Enthusiastic Admiration is the first Principle of Knowledge and its last.

I was in a Printing-house in Hell, and saw the method in which knowledge is transmitted from generation to generation.