Related:

• Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
  -- Douglas Adams, Last Chance to See...
• Learn what not to do from the experience of others. It's cheaper than your own. -- J. Winter Smith
• The ability to make love frivolously is the thing which distinguishes human beings from the beasts.
  -- Heywood Brou...
• The ability to make love frivolously is the chief characteristic that distinguishes human beings from the beasts.
  Heywood Brou...
• Humans hardly ever learn from the experience of others.
  They learn - when they do, which isn't often - on their own, the hard way....
• Anyone who profits from the experience of others probably writes biographies. JONES
• Freedom is not worth having if it does not connote freedom to err.
  It passes my comprehension how human beings, be they ever so experienced and able, can delight in depriving other human beings of that precious right....
• Not only is "The Hitchhiker's Guide to the Galaxy" a wholly remarkable book
  it is also a highly successful one - more popular than the "Celestial Home Care Omnibus", better selling than "Fifty-three More Things to Do in Zero Gravity", and more controversial than Oolon Colluphid's trilogy of philosophical blockbusters, "Where God Went Wrong", "Some More of God's Greatest Mistakes" and "Who Is This God Person Anyway?...
• You live and learn. At any rate, you live. -- Douglas Adam