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Not everything that can be counted counts, and not everything that counts can be counted. (Albert Einstein)

In the End, we will remember not the words of our enemies, but the silence of our friends. (Martin Luther King Jr.)

Once is happenstance. Twice is coincidence. Three times is enemy action. (Auric Goldfinger, in Goldfinger by Ian L. Fleming)

The fundamental cause of trouble in the world is that the stupid are cocksure while the intelligent are full of doubt. (Bertrand Russell)

Each problem that I solved became a rule which served afterwards to solve other problems. (Rene Descartes, Discours de la Methode)