Man errs, till he has ceased to strive.

Never let a day pass without looking at some perfect work of art, hearing some great piece of music and reading, in part, some great book.

There is nothing new on earth / For a person who lives long and experiences much. / In my years of youthful wandering / I have seen crystallized people.

Plunge boldly into the thick of life!

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.

Mastery is often taken for egotism.

If any man wish to write in a clear style, let him be first clear in his thoughts; and if any would write in a noble style, let him first possess a noble soul.