Pleasurable experiences are fine, but if you don't remember them, you
get that pleasure only once, and you can't even be sure of that.
Memory has an important function for people.... We talk a great deal
about learning from experience, but from which experiences? We don't
ordinarily think about learning from eating a meal, but learning from
the meal is one reason we eat it. A more important reason, of course,
is that we are hungry.
-- Roger C. Schank. "The Connoisseur's Guide to the Mind"