A man should learn to detect and watch that gleam of light which flashes across his mind from within, more than the luster of the firmament of bards and sages

Men such as they are, very naturally seek money or power; and power because it is as good as money.

Nothing astonishes men so much as common sense and plain dealing.

To speak truly, few adult persons can see nature. Most persons do not see the sun.

Whenever a true theory appears, it will be its own evidence. Its test is, that it will explain all phenomena.

Every burned book or house enlightens the world; every suppressed or expunged word reverberates through the earth from side to side.

Knowledge is when you learn something new every day. Wisdom is when you let something go every day.