"You can argue that it's a different world now than the one when Matthew Shepard was killed, but there is a subtle difference between tolerance and acceptance. It's the distance between moving into the cul-de-sac and having your next door neighbor trust you to keep an eye on her preschool daughter for a few minutes while she runs out to the post office. It's the chasm between being invited to a colleague's wedding with your same-sex partner and being able to slow-dance without the other guests whispering."

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A scientist's life, the author says, is indeed conflictual, formed by battles, defeats, and victories: but the adversary is always and only the unknown, the problem to be solved, the mystery to be clarified. It is never a matter of civil war; even though of different opinions, or of different political leanings, scientists dispute each other, they compete, but they do not battle: they are bound together by a strong alliance, by the common faith "in the validity of Maxwell's or Boltzmann's equations," and by the common acceptance of Darwinism and the molecular structure of DNA.

— Primo Levi