Make your work to be in keeping with your purpose
Men of lofty genius when they are doing the least work are most active.
A painter should begin every canvas with a wash of black, because all things in nature are dark except where exposed by the light.
All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
As a well spent day brings happy sleep, so life well used brings happy death.
Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.
The knowledge of all things is possible
Study without desire spoils the memory, and it retains nothing that it takes in.
Art is never completed, only abandoned.
The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.