The Medici made me and the Medici destroyed me.

No human investigation can claim to be scientific if it doesn't pass the test of mathematical proof.

Life, when is spent well, is long.

The Book of the science of Mechanics must precede the Book of useful inventions.

Supreme happiness will be the greatest cause of misery, and the perfection of wisdom the occassion of folly.

You will never have a greater or lesser dominion than that over yourself.

The Bactrian have two humps; the Arabian one only. They are swift in battle and most useful to carry burdens. This animal is extremely observant of rule and measure, for it will not move if it has a greater weight than it is used to, and if it is taken too far it does the same, and suddenly stops and so the merchants are obliged to lodge there.