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