As for an ultimate purpose or transcending moral order, all the great thinkers since ancient Greece have failed to find one. The best philosophical minds have dug into this for 25 centuries, without success. There have been endless theories, but no clear answer. Martin Heidegger concluded that we are doomed to live our whole lives and die without knowing why we’re here. That’s existentialism: All we can really know is that we and the material world exist.

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