Sowing is not as difficult as reaping.

Things which matter most must never be at the mercy of things which matter least.

If you don't know foreign languages, you don't know anything about your own.

Gray are all the theories, But green is the tree of life.

Life is too short to drink bad wine.

We cannot too soon convince ourselves how easily we may be dispensed with in the world. What important personages we imagine ourselves to be! We think that we alone are the life of the circle in which we move; in our absence, we fancy that life, existence, breath will come to a general pause, and, alas, the gap which we leave is scarcely perceptible, so quickly is it filled again; nay, it is often the place, if not of something better, at least for something more agreeable.

When the boy begins to understand that the visible point is preceded by an invisible point, that the shortest distance between two points is conceived as a straight line before it is ever drawn with pencil and paper...the fountain of all thought has been opened to him...the philosopher can reveal him nothing new, as a geometrician he has discovered the basis of all thought.