The only way to get rid of a temptation is to yield to it. (Oscar Wilde)

I don’t know why we are here, but I’m pretty sure that it is not in order to enjoy ourselves. (Ludwig Wittgenstein)

Be nice to people on your way up because you meet them on your way down. (Jimmy Durante)

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