Whoever in debate quotes authority uses not intellect, but memory.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer. Go some distance away because then the work appears smaller and more of it can be taken in at a glance and a lack of harmony and proportion is more readily seen.

Thou, O God, dost sell us all good things at the price of labor.

All objects transmit their image to the eye in pyramids and the nearer to the eye these pyramids are intersected the smaller will the image appear of the objects which cause them.

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.

Poor is the man who desires a lot

You don't get into trouble because of the things you don't know. It is the things you don't know you don't know that really get you into a mess.