Related:

• The happiness and unhappiness of the rational, social animal depends not on what he feels but on what he doe
  just as his virtue and vice consist not in feeling but in doing....
• How much time he gains who does not look to see what his neighbour says or does or thinks, but only at what he does himself, to make it just and holy.
  -- Marcus Aurelius Antoninus (121-180 AD) -- Meditations, iv, 18...
• A man is accepte into a church for what he believes and he is turned out for what he knows.
  -- Mark Twai...
• It's hard to argue with someone who knows what he's talking about.
• The whole world steps aside for the man who knows where he is going.
• He who knows not and knows that he knows not is ignorant.
  Teach him. He who knows not and knows not that he knows not is a fool....
• No man knows of what stuff he is made until prosperity and ease try him. -- A.P. Gouthey
• The most important thing in a man is not what he knows, but what he is. -- Narciso Yepe
• No one knows what he can do till he tries. -- Publius Syrus (42 BC) -- Maxim 786