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.

Those who become enamoured of the art, without having previously applied to the diligent study of the scientific part of it, may be compared to mariners who put to the sea in a ship without rudder or compass and therefore cannot be certain of arriving at the wished for port.

We may call painting the grandchild of nature.

Inequality is the cause of all local movements.

Threats alone, are the weapons of the threatened man.

Every now and then go away, have a little relaxation, for when you come back to your work your judgment will be surer.

As you cannot do what you want, Want what you can do