Should I not be proud, when for twenty years I have had to admit to myself that the great Newton and all the mathematicians and noble calculators along with him were involved in a decisive error with respect to the doctrine of color, and that I among millions was the only one who knew what was right in this great subject of nature?

The artist alone sees spirits. But after he has told of their appearing to him, everybody sees them.

I do not now begin, - I still adore Her whom I early cherish'd in my breast; Then once again with prudence dispossess'd, And to whose heart I'm driven back once more. The love of Petrarch, that all-glorious love, Was unrequited, and, alas, full sad.

The follies of the wise man are known to himself, but hidden from the world.

God help us -- for art is long, and life so short.

Courage and modesty are the most unequivocal of virtues, for they are of a kind that hypocrisy cannot imitate; they too have this quality in common, that they are expressed by the same color.

I never knew a more presumptuous person than myself. The fact that I say that shows that what I say is true.