After twenty years, Ash Sutton returns in a cracked-up ship without food, air or water—only to report that the mysterious planet that nobody can visit is no threat to Earth. But a man from the future insists that Sutton must be killed to stop a war in time; while Sutton himself, who has developed metaphysical, religious leanings, finds a copy of This Is Destiny, the very book that he is planning to write.
It would reach back to win its battles. It would strike at points in time and space which would not even know that thre was a war. It could, logically, go back to the silver mines of Athens, to the horse and chariot of Thutmosis III, to the sailing of Columbus.

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  1. Time and Again by Clifford D. Simak, in Galaxy, October to December 1950 [3-part serial].
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Clifford D. Simak