All of our actions take their hue from the complexion of the heart, as landscapes their variety from light.

If any human being earnestly desire to push on to new discoveries instead of just retaining and using the old; to win victories over Nature as a worker rather than over hostile critics as a disputant; to attain, in fact, clear and demonstrative knowlegde instead of attractive and probable theory; we invite him as a true son of Science to join our ranks.

To say that a man lieth, is as much to say, as that he is brave towards God, and a coward towards men.

Science is but an image of the truth.

In nature things move violently to their place, and calmly in their place.

Princes are like heavenly bodies, which cause good or evil times, and which have much veneration, but no rest.

There is no such flatterer as is a man's self.