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.

Being engulfed in practice without delicate knowledge related to it, is in many ways like entering a ship without knowing where it is headed.

Good writing comes from good talent.

O Lord, thou givest us everything, at the price of an effort.

simplicity is the best sophistication

Nature alone is the master of true genius.

The body of the earth is of the nature of a fish... because it draws water as its breath instead of air.