Old age takes in part savoury wisdom for its food - see to that your old age will not lack in nourishment.

What is fair in men, passes away, but not so in art

Having wandered some distance among gloomy rocks, I came to the entrance of a great cavern ... Two contrary emotions arose in me: fear and desire--fear of the threatening dark cavern, desire to see whether there were any marvelous things in it.

A bird is an instrument working according to mathematical law, which instrument it is within the capacity of man to reproduce with all its movements.

Not to anticipate is already to moan.

The first object of the painter is to make a flat plane appear as a body in relief and projecting from that plane

To speak ill of a good person is not truly good, all in all.