The Medici made me and the Medici destroyed me.

An artist who lacks the power of self-criticism accomplishes but little. It is good if your work stands higher than your own opinion of it; bad if it is on the same level. But it is a great disaster if your work stands lower than your judgment of it.

All our knowledge has its origins in our perceptions.

He who wishes to be rich in a day will be hanged in a year.

How painting surpasses all human works by reason of the subtle possibilities which it contains.

It is an acknowledged fact that we perceive errors in the work of others more readily than in our own.

If you are alone you belong entirely to yourself. If you are accompanied by even one companion you belong only half to yourself or even less in proportion to the thoughtlessness of his conduct and if you have more than one companion you will fall more deeply into the same plight.