The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

The knowledge of all things is possible

For those colours which you wish to be beautiful, always first prepare a pure white ground.

Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.

I have discovered that a screw-shaped device such as this, if it is well made from starched linen, will rise in the air if turned quickly.

The painter's mind is a copy of the divine mind, since it operates freely in creating the many kinds of animals, plants, fruits, landscapes, countrysides, ruins, and awe-inspiring places.

One painter ought never to imitate the manner of any other; because in that case he cannot be called the child of nature, but the grandchild. It is always best to have recourse to nature, which is replete with such abundance of objects, than to the productions of other masters, who learnt everything from her.