Learning acquired in youth arrests the evil of old age.

To be a winner you must want to win but must know of the chance of losing and must not fear of it.

You grow in reputation like bread in the hands of a child.

It is ordained that to the ambitious, who derive no satisfaction from the gifts of life and the beauty of the world, life shall be a cause of suffering, and they shall possess neither the profit nor the beauty of the world.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.

Oh! Speculators on things, boast not of knowing the things that nature ordinarily brings about; but rejoice if you know the end of those things which you yourself device.

Who would believe that so small a space could contain the images of all the universe?