Experience is a truer guide than the words of others.

A single and distinct luminous body causes stronger relief in the objects than a diffused light; as may be seen by comparing one side of a landscape illuminated by the sun, and one overshadowed by clouds, and illuminated only by the diffused light of the atmosphere.

Who would believe that so small a space could contain the images of all the universe?

A deaf and dumb person who sees two men in conversation - may nevertheless understand from the attitudes and gestures of the speakers, how well their discussion is getting along.

Knowledge ... shall always bear witness like a clarion to its creator.

Avoid studies of which the result dies with the worker.

You don't get into trouble because of the things you don't know. It is the things you don't know you don't know that really get you into a mess.