Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius—and a lot of courage to move in the opposite direction.

Actually written by E. F. Schumacher in a 1973 essay titled "Small is Beautiful" which appeared in The Radical Humanist: volume 37, p. 22. Earliest published source found on Google Books attributing this to Einstein is BMJ: The British Medical Journal, volume 319, 23 October 1999, p. 1102. It was attributed to Einstein on the internet somewhat before that, for example in this 1997 post.