"If history repeats itself, and the unexpected always happens, how incapable must Man be of learning from experience."
George Bernard Shaw
Late 19th/early 20th century Irish poet/co-found of the London School of Economics
(Contributed by Ron Hixon)
While I don't think the unexpected "always" happens, I do so enough to understand the point of this quote.
We are capable of learning from experience, we just don't choose to do so nearly enough.