"Life now insists that we encounter groundlessness. Systems and ideas that seemed reliable and solid dissolve at an increasing rate. People who asked for our trust betray or abandon us. Strategies that worked suddenly don't. Groundlessness is a frightening place, at least at first, but as the old culture turns to mush, we would feel stronger if we stopped searching for ground, if we sought only to locate ourselves in the present and do our work from here."

Previous Quote

But space travel can't ease the pressure on a planet grown too crowded not even with today's ships and probably not with any future ships-because stupid people won't leave the slopes of their home volcano even when it starts to smoke and rumble. What space travel does do is drain off the best brains: those smart enough to see a catastrophe before it happens, and with the guts to pay the price-abandon home, wealth, friends, relatives, everything-and go. That's a tiny fraction of one percent. But that's enough.

— Robert A. Heinlein