The little demon Azazel (the hero of many an Asimov tale) sends a world-renowned writer travels back in time to see his first writing teacher at a 1934 school that is remarkably like Asimov’s own Boys High in Brooklyn.
“Because,” and here he struck his chest a resounding thump, “the burning memories of youthful snubs and spurnings remain unavenged and, indeed, forever unavengable.”

Variants

(1)
  1. “The Time Traveler” by Isaac Asimov, in Asimov’s Science Fiction, November 1990.
    2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by Isaac Asimov