True works of art contain their own theory and give us the measurement according to which we should judge them.

No one has ever learned fully to know themselves.

Whoever makes it a rule to test action by thought, thought by action, cannot falter, and if he does, will soon find his way back to the right road.

For I have been a man, and that means to have been a fighter.

Men are much more apt to agree in what they do than in what they think.

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.

The flowers of life are but illusions. How many fade away and leave no trace.