I am never weary of being useful... In serving others I cannot do enough. No labor is sufficient to tire me.
Leonardo da VinciWhy are the bones of great fishes, and oysters and corals and various other shells and sea-snails, found on the high tops of mountains that border the sea, in the same way in which they are found in the depths of the sea?
Leonardo da VinciThe light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.
Leonardo da VinciThe Bactrian have two humps; the Arabian one only. They are swift in battle and most useful to carry burdens. This animal is extremely observant of rule and measure, for it will not move if it has a greater weight than it is used to, and if it is taken too far it does the same, and suddenly stops and so the merchants are obliged to lodge there.
Leonardo da Vinci