The limit of man's knowledge in any subject possesses a high interest which is perhaps increased by its close neighbourhood to the realms of imagination.

Imagination without deep and full knowledge is a snare.

I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

However far man may extend himself with his knowledge, however objective he may appear to himself - ultimately he reaps nothing but his own biography.

The true sign of intelligence is not knowledge but imagination.

What is important is not the quantity of your knowledge but its quality. You can know many things without knowing the most important.