The organ of perception acts more readily than judgment.

The fox when it sees a flock of herons or magpies or birds of that kind, suddenly flings himself on the ground with his mouth open to look as he were dead; and these birds want to peck at his tongue, and he bites off their heads.

It is easier to contend with evil at the first than at the last.

Nothing will be left, Nothing in the air, nothing under the earth, nothing in the waters. All will be exterminated.

Those who become enamoured of the art, without having previously applied to the diligent study of the scientific part of it, may be compared to mariners who put to the sea in a ship without rudder or compass and therefore cannot be certain of arriving at the wished for port.

Avoid studies of which the result dies with the worker.

I am not to blame for putting forward, in the course of my work on science, any general rule derived from a previous conclusion.