Nothing will be left, Nothing in the air, nothing under the earth, nothing in the waters. All will be exterminated.

Perspective is nothing more than a rational demonstration applied to the consideration of how objects in front of the eye transmit their image to it, by means of a pyramid of lines. The Pyramid is the name I apply to the lines which, starting from the surface and edges of each object, converge from a distance and meet in a single point.

Inaction saps the vigor of the mind.

Poor is the pupil who does not surpass his master.

I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils

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

No human investigation can be called real science if it cannot be demonstrated mathematically.