"We can learn from history how
past generations thought and acted, how they responded to the
demands of their time and how they solved their problems. We can
learn by analogy, not by example, for our circumstances will always
be different than theirs were. The main thing history can teach us
is that human actions have consequences and that certain choices,
once made, cannot be undone. They foreclose the possibility of
making other choices and thus they determine future events.