Children

Children are the living messages we send to a time we will not see.
  ~Neil Postman, The Disappearance of Childhood (introduction), 1982

"It's a question of discipline," the little prince told me later on.  "When you've finished washing and dressing each morning, you must tend your planet." 
 ~Antoine de Saint-Exupéry, The Little Prince, 1943, translated from French by Richard Howard