All our knowledge has its origins in our perceptions.

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

Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.

Music cannot be called otherwise than the sister of painting, for she is dependent upon hearing, a sense second to sight, and her harmony is composed of the union of its proportional parts sounded simultaneously, rising and falling in one or more harmonic rhythms.

If you are representing a white body let it be surrounded by ample space, because as white has no colour of its own, it is tinged and altered in some degree by the colour of the objects surrounding it

Lying on a feather mattress or quilt will not bring you renown.

Details make perfection, and perfection is not a detail.