The thinker makes a great mistake when he asks after cause and effect. They both together make up the indivisible phenomenon.

True art can only spring from the intimate linking of the serious and the playful.

Hypotheses are only the pieces of scaffolding which are erected round a building during the course of construction, and which are taken away as soon as the edifice is completed.

Gray are all the theories, But green is the tree of life.

The most difficult thing is what is thought to be the simplest; to really see the things which are before your eyes.

There are three classes of readers; some enjoy without judgment; others judge without enjoyment; and some there are who judge while they enjoy, and enjoy while they judge. The latter class reproduces the work of art on which it is engaged. Its numbers are very small.

The older we get the more we must limit ourselves if we wish to be active.