That nature does not care, one way or the other, is the true abyss. That only man cares, in his finitude facing nothing but death, alone with his contingency and the objective meaninglessness of his projecting meanings, is a truly unprecedented situation.

Act so that the effects of your actions are compatible with the permanence of genuine human life.

To me, it was a sad fate to have been born into a period and a world where everything was in tip-top order, and the only real excitement was to be found in history books and occasionally also in the paper.

Unlike the interference of ordinary interest, power, or prejudice, which touches philosophy only at its outskirts and becomes at most a matter for philosophical tactics, the claim of revelation to the highest truth touches philosophy at its core and must affect its whole strategy.

The simple truth of our finiteness is that we could, by whatever means, go on interminably only at the price of either losing the past and, therewith, our identity, or living only in the past and therefore without a real present. We cannot seriously wish either and thus not a physical enduring at that price.

Judaism and Christianity in themselves are distinctly separate entities, to be sure; but when considering their influence on Western thought, we must bear in mind that Christianity alone, or almost alone, transmitted the Jewish share, simply by what it contained of it in its own, original constitution.