Marriage is like putting your hand into a bag of snakes in the hope of pulling out an eel.

O painter skilled in anatomy, beware lest the undue prominence of the bones, sinews and muscles cause you to become a wooden painter from the desire to make your nude figures reveal all.

The painter who draws by practise and judgment of the eye without the use of reason is like the mirror which reproduces within itself all the objects which are set opposite to it without knowledge of the same.

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

O Lord, thou givest us everything, at the price of an effort.

The grave will fall in upon him who digs it.

As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.