When I investigate and when I discover that the forces of the heavens and the planets are within ourselves, then truly I seem to be living among the gods.

As ability goes, so goes our fortune.

A common error of ignorance is to maintain that what one does not know does not exist.

Nothing overshadows truth so much as authority.

It is very rarely granted even to Nature herself to produce anything absolutely perfect in every part.

Errors accumulate in the sketch and compound in the model.

The greatest work of an artist is the history of a painting.