O Time! consumer of all things; O envious age! thou dost destroy all things and devour all things with the relentless teeth of years, little by little in a slow death. Helen, when she looked in her mirror, seeing the withered wrinkles made in her face by old age, wept and wondered why she had twice been carried away.
Leonardo da VinciThere is no object so large but that at a great distance from the eye it does not appear smaller than a smaller object near.
Leonardo da VinciJust as eating against one's will is injurious to health, so studying without a liking for it spoils the memory, and it retains nothing it takes in.
Leonardo da Vinci