Then, in 1970, it ended. Grothendieck discovered that the IHÉS was receiving a portion of its funding from French military sources. To many people, this might have registered as an inconvenient administrative footnote — the kind of institutional compromise one quietly accepts and moves past. Not to Grothendieck. His father had been gassed at Auschwitz. He had spent part of his childhood hiding in the woods to avoid being handed over to the same machinery of state violence. His pacifism was not a political position he had arrived at through argument; it was something closer to scar tissue. He resigned from the IHÉS immediately. He never returned to a permanent mathematical position of that kind. The mathematical community, for its part, never fully recovered his attention — and given what he had produced in those twelve years, that loss is worth sitting with for a moment.