The true method of knowledge is experiment.

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

I sometimes try to be miserable that I may do more work, but find it is a foolish experiment.

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.

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