The acquisition of knowledge is always of use to the intellect, because it may thus drive out useless things and retain the good. For nothing can be loved or hated unless it is first known.
Leonardo da VinciThe mind that engages in subjects of too great variety becomes confused and weakened.
Leonardo da VinciA day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.
Leonardo da VinciI roamed the countryside searching for answers to things I did not understand. Why shells existed on the tops of mountains. How the various circles of water form around the spot which has been struck by a stone, and why a bird sustains itself in the air.
Leonardo da Vinci