Related:

• The fool doth think he is wise, but the wise man knows himself to be a fool.
  -- William Shakespeare (1564-1616), As You Like It -- Act v, Sc. 1...
• Without passion man is a mere latent force and possibility, like the flint which awaits the shock of the iron before it can give forth its spark.
  -- Henri-Frederic Amiel...
• The end of man is an action, and not a thought, though it were the noblest. -- Carlyle
• The eye sees only what the mind is prepared to comprehend. -- Henri Bergson (1859-1941)
• For purposes of action nothing is more useful than narrowness of thought combined with energy of will.
  -- Henri Frederic Amiel...
• If once a man indulges himself in murder, very soon he comes to think little of robbing
  and from robbing he next comes to drinking and Sabbath-breaking, and from that to incivility and procrastination....
• If once a man indulges himself in murder, very soon he comes to think little of robbing
  and from robbing he next comes to drinking and Sabbath-breaking, and from that to incivility and procrastination....
• I feel like a man trapped in a man's body.