Related:

• He who knows does not speak, He who speaks does not know. -- Lao Tzu
• He who knows that enough is enough will always have enough. -- Lao Tsu
• Who does not trust enough will not be trusted. -- Lao Tsu
• He who knows others is wise. He who knows himself is enlightened. -- Lao Tsu
• He who knows others is clever; he who knows himself is enlightened.
  -- Lao-tzu, Chinese philosopher and founder of Taoism...
• No one is fit to be trusted with power. ... No one.
  ... Any man who has lived at all knows the follies and wickedness he's capable of....