How was I able to live alone before, my little everything? Without you I lack self-confidence, passion for work, and enjoyment of life--in short, without you, my life is no life. [Written to his wife, Mileva]

Smoke like a chimney, work like a horse, eat without thinking, go for a walk only in really pleasant company.

Violence sometimes may have cleared away obstructions quickly, but it never has proved itself creative.

The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat.

Playfullness is the essential feature of productive thought.

It's not that I'm so smart, it's just that I stay with problems longer.

Manager solves problems, leader prevents them.