To love oneself is the beginning of a lifelong romance (Oscar Wilde)

I have not failed. I’ve just found 10,000 ways that won’t work. (Thomas Alva Edison)

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

In theory, there is no difference between theory and practice. But in practice, there is. (Yogi Berra)