A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.

The first object of the painter is to make a flat plane appear as a body in relief and projecting from that plane

The part always has a tendency to reunite with its whole in order to escape from its imperfection.

Supreme happiness will be the greatest cause of misery, and the perfection of wisdom the occassion of folly.

There is no object so large but that at a great distance from the eye it does not appear smaller than a smaller object near.

Oh! Speculators on things, boast not of knowing the things that nature ordinarily brings about; but rejoice if you know the end of those things which you yourself device.

He who walks straight rarely falls.