A clever man without wisdom is like a beautiful flower without fragrance.

Whoever does not respect life, does not deserve it.

Nothing is more apt to deceive us than our own judgment of our work. We derive more benefit from having our faults pointed out by our enemies than from hearing the opinions of friends.

Perspective is a most subtle discovery in mathematical studies, for by means of lines it causes to appear distant that which is near, and large that which is small.

It should not be hard for you to stop sometimes and look into the stains of walls, or ashes of a fire, or clouds, or mud or like places, in which...you may find really marvellous ideas.

Being willing is not enough. We must do.

A day will come in which men will look upon an animal's murder the same way they look today upon a man's murder.