Between the difficulties, one hides the opportunity
What counts can't always be counted; what can be counted doesn't always count.
Outer changes always begin with an inner change of attitude.
In any conflict between humanity and technology, humanity will win.
God casts the die, not the dice.
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]