Thinking is hard work; that's why so few do it.

The sceptic will say, 'It may well be true that this system of equations is reasonable from a logical standpoint, but this does not prove that it corresponds to nature.' You are right, dear sceptic. Experience alone can decide on truth.

This is a time, when there seems to be a particular need for friends of wisdom and truth to join together.

Mysticism is in fact the only criticism people cannot level against my theory.

Beyond the realms of what we see, into the regions or the unexplored limited only by our imaginations.

While it is true that an inherently free and scrupulous person may be destroyed, such an individual can never be enslaved or used as a blind tool.

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]