Imagination is more valuable than information.

What distinguishes the language of science from language as we ordinarily understand the word? ... What science strives for is an utmost acuteness and clarity of concepts as regards their mutual relation and their correspondence to sensory data.

Don't listen to the person who has the answers; listen to the person who has the questions.

The true sign of intelligence is not knowledge but imagination.

But the creative principle resides in mathematics. In a certain sense, therefore, I hold true that pure thought can grasp reality, as the ancients dreamed.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. He to whom the realm of the spirit for your own personal joy and to the profit of the community to which your later work belongs.

To put it boldly, it is the attempt at a posterior reconstruction of existence by the process of conceptualization.