Colonization means potential immortality for the human genus. Man's safety on Earth was never great, and it dwindles hourly. Disarmament, even world government, will not guarantee survival in an age when population presses natural resources to the limit and when the knowledge of how to work mischief on a planetary scale is ever more widely diffused among peoples who may grow ever more desperate.
Poul AndersonBetter a life like a falling star, brief bright across the dark, than the long, long waiting of the immortals, loveless and cheerlessly wise.
Poul AndersonMy knowledge of the human psyche is as yet imperfect. Certain areas won't yield to computation.
Poul Anderson