Give me chastity and continence, but not yet. (Saint Augustine)

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

Do, or do not.There is no ‘try’. (Yoda)

If you want to make an apple pie from scratch, you must first create the universe. (Carl Sagan)

Talent does what it can; genius does what it must. (Edward George Bulwer-Lytton)