Learning never exhausts the mind.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

The lover is moved by the thing loved, as the sense is by that which perceives, and it unites with it and they become one and the same thing... when the lover is united with the beloved it finds rest there; when the burden is laid down there it finds rest.

Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.

That which can be lost cannot be deemed riches.

Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye.

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