When I first read Sartre and Heidegger, I didn’t think the details of a philosopher’s personality or biography were important. This was the orthodox belief in the field at the time, but it also came from my being too young myself to have much sense of history. I intoxicated myself with concepts, without taking account of their relationship to events and to all the odd data of their inventors’ lives. Never mind lives; ideas were the thing. Thirty years later, I have come to the opposite conclusion. Ideas are interesting, but people are vastly more so. That is why, among all the existentialist
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