Tears come from the heart and not from the brain
The Book of the science of Mechanics must precede the Book of useful inventions.
Knowledge ... shall always bear witness like a clarion to its creator.
Any color is more distinctly seen when opposed to its contrary: thus, black on white, blear near yellow, green near red, and so on.
He who walks straight rarely falls.
Experience never misleads; what you are misled by is only your judgment, and this misleads you by anticipating results from experience of a kind that is not produced by your experiments.