Related:

• Know thyself. -- Thale
• There are two sentences inscribed upon the Delphic oracle, hugely accommodated to the usages of man's life
  Know thyself", and "Nothing too much"; and upon these all other precepts depend....
• Know Thyself" was written over the portal of the antique world.
  Over the portal of the new world, "Be Thyself" shall be written....
• Know then thyself, presume not God to scan; The proper study of mankind is man.
  -- Alexander Pope (1688-1744) -- Essay on Man, Epistle ii, Line 1...
• Know thyself. If you need help, call the C.I.A.