Remember and remember again, that in dark times all a man need do is seek the truth. Protect it and speak it. Then, even if he is a wanderer for years and years, righteousness shall survive while the tallest of castles crumble.
And I know that we won't be able to escape it in deep space, either. We might succeed in ignoring this doubt for a while—keep everyone so busy doing what it takes to build the ships to get us out there. But eventually the bustle ends, and then we're left with ourselves again. It'll be the loneliest revelation ever—half a million miles from home.