With the blind jumps we took through hyperspace, it's lucky we didn't land up in a sun's belly. - Isaac Asimov

you can’t just move backward. You can’t push the chicken back into the egg, wine back into the grape, the boy back into the womb. If you want the baby to let go of your watch, you don’t just try to explain that he ought to do it — you offer him something he would rather have.

the mere act of not being a traitor is also a long way from agreeing to be an active helper.

Pyscho-history dealt not with man, but with man-masses. It was the science of mobs; mobs in their billions. It could forecast reactions to stimuli with something of the accuracy that a lesser science could bring to the forecast of a rebound of a billiard ball. The reaction of one man could be forecast by no known mathematics; the reaction of a billion is something else again.