I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.

Happiness, as a pursuit, is suitable only for pigs.

Only a very dull man spells a word the same way twice.

As the area of light expands, so does the perimeter of darkness.

The history of scientific and technical discovery teaches us that the human race is poor in independent and creative imagination.

But without deeper reflection one knows from daily life that one exists for other people--first of all for those upon whose smiles and well-being our own happiness is wholly dependent, and then for the many, unknown to us, to whose destinies we are bound by the ties of sympathy.

The Universe is a friendly place.