If you do not rest on the good foundation of nature, you will labour with little honor and less profit.

We, by our arts may be called the grandsons of God.

Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.

Weight is caused by one element being situated in another; and it moves by the shortest line towards its centre, not by its own choice, not because the centre draws it to itself, but because the other intervening element cannot withstand it.

It's not enough that you believe what you see. You must also understand what you see.

Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.