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.

He who thinks little errs much.

Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

He who cannot establish dominion over himself will have no dominion over others.

While you are alone you are entirely your own master and if you have one companion you are but half your own, and the less so in proportion to the indiscretion of his behavior.