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On the Schleiermacher episode, we spent some time comparing On Religion to Kant’s religious arguments, particularly citing Kant’s Critique of Practical Reason. Kant did not try to prove God’s existence or the soul’s immortality. Rather, he postulated those concepts as helpful ways to help realize the summum bonum, the highest good. “Postulate” is defined as a “a hypothesis advanced as an essential presupposition, condition, or premise of a train of reasoning.”

With that in mind, read along as you listen to this passage from the Critique of Practical Reason. Reviewing it may help highlight what Schleiermacher was rejecting:

The Immortality of the Soul as a Postulate of Pure Practical Reason

The realization of the summum bonum [highest good] in the world is the necessary object of a will determinable by the moral law. But in this will the perfect accordance of the mind with the moral law is the supreme condition of the summum bonum. This then must be possible, as well as its object, since it is contained in the command to promote the latter.

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