Shadow is a colour as light is, but less brilliant; light and shadow are only the relation of two tones.

You must think. The eye is not enough; it needs to think as well.

Everything vanishes, falls apart, doesn't it? Nature is always the same but nothing in her that appears to us lasts. Our art must render the thrill of her permanence, along with her elements, the appearance of all her changes. It must give us a taste of her Eternity.

I have to keep working, not to arrive at finish, which arouses the admiration of fools... I must seek completion only for the pleasure of being truer and more knowing.

Time and reflection change the sight little by little 'till we come to understand.

An art which isn't based on feeling isn't an art at all... feeling is the principle, the beginning and the end; craft, objective, technique - all these are in the middle.

When I start thinking, all is lost.