Why does the eye see a thing more clearly in dreams than the imagination when awake?
Leonardo da VinciI abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils
Leonardo da VinciThose who are enamoured of practice without science are like a pilot who goes into a ship without rudder or compass and never has any certainty of where he is going. Practice should always be based upon a sound knowledge of theory.
Leonardo da VinciNo human investigation can be called real science if it cannot be demonstrated mathematically.
Leonardo da VinciIn the days of thy youth seek to obtain that which shall compensate the losses of thy old age.
Leonardo da VinciTo speak of this subject you must... explain the nature of the resistance of the air, in the second the anatomy of the bird and its wings, in the third the method of working the wings in their various movements, in the fourth the power of the wings and the tail when the wings are not being moved and when the wind is favourable to serve as guide in various movements.
Leonardo da Vinci