If one wished to personalize the message of the novel, one might speculate that Asimov, looking back over his own past, had concluded that no amount of tinkering would have changed it for the better. This is, indeed, one of the messages of his autobiographical writings. Everything happened for the best: Campbell's early rejections, Sam Merwin's rejection of "Grow Old with Me," the change of administration at the Boston University School of Medicine that led to his full-time writing (which still awaited him). . . . If he had had the opportunity to make things happen differently, he might have made the wrong choice, he might have said, might have chosen safety and mediocrity over risk and greatness. In
The End of Eternity,
at least, Asimov chose, as rationally as he could, uncertainty over certainty and infinity over not eternity but Eternity, that is, over the limitation of man's possibilities by too much tinkering with them. Asimov was not denying humanity's potential for rationality or the need for considering choices rationally but humanity's capacity to play God. Humanity will not consciously choose the uncertainty of adventure, or the adventure of uncertainty.