It vexes me greatly that having to earn my living has forced me to interrupt the work and to attend to small matters.
Leonardo da VinciThough I may not . . . be able to quote other authors, I shall rely on that which is much greater and more worthy - on experience.
Leonardo da VinciLet proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.
Leonardo da VinciI have been impressed with the urgency of doing. Knowing is not enough; we must apply. Being willing is not enough; we must do.
Leonardo da Vinci