It is useful to constantly observe, note, and consider.

A life well used procures a happy death.

Poetry is superior to painting in the presentation of words, and painting is superior to poetry in the presentation of facts. For this reason I judge painting to be superior to poetry.

The young man should first learn perspective, then the proportions of objects. Next, copy work after the hand of a good master, to gain the habit of drawing parts of the body well; and then 39 to work from nature, to confirm the lessons learned.

The natural desire of good men is knowledge.

I wish to work miracles

If you cause your ship to stop and place the head of a long tube in the water and place the outer extremity to your ear, you will hear ships at a great distance from you.

A day will come in which men will look upon an animal’s murder the same way they look today upon a man’s murder.

Who would believe that so small a space could contain the images of all the universe?

Small rooms or dwellings discipline the mind, large ones weaken it.