My own life has been spent chronicling the rise and fall of
human systems, and I am convinced that we are terribly
vulnerable.... We should be reluctant to turn back upon the
frontier of this epoch. Space is indifferent to what we
do; it has no feeling, no design, no interest in whether
or not we grapple with it. But we cannot be indifferent to
space, because the grand, slow march of intelligence has brought
us, in our generation, to a point from which we can explore and
understand and utilize it. To turn back now would be to deny
our history, our capabilities.
-- James A Michener