Of several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.

Test knowledge through experience, be prepared to make mistakes, and be persistent about it.

I have offended God and mankind because my work didn't reach the quality it should have.

The painter will produce pictures of little merit if he takes the works of others as his standard.

Why are the bones of great fishes, and oysters and corals and various other shells and sea-snails, found on the high tops of mountains that border the sea, in the same way in which they are found in the depths of the sea?

I have been impressed with the urgency of doing.

Ask advice of him who governs himself well.