Life is like riding a bicycle. To keep your balance you must keep moving.

Beim Menschen ist es wie beim Velo. Nur wenn er faehrt, kann er bequem die Balance halten.

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Citation

Einstein, Albert. "Letter to his son Eduard." Quoted in Einstein: His Life and Universe, by Walter Isaacson. Simon & Schuster, 2007. Originally from Letter to his Son Eduard, 5 Feb. 1930.