Chapter V — The Rationalist Dissolution

The great master of rationalist phenomenalism, David Hume, begins his essay "On the Immortality of the Soul" with these decisive words: "It appears difficult by the mere light of reason to prove the immortality of the soul. The arguments in favour of it are commonly derived from metaphysical, moral, or physical considerations. But it is really the Gospel, and only the Gospel, that has brought to light life and immortality." Which is equivalent to denying the rationality of the belief that the soul of each one of us is immortal.

Kant, whose criticism found its point of departure in Hume, attempted to establish the rationality of this longing for immortality and the belief that it imports; and this is the real origin, the inward origin, of his Critique of Practical Reason, and of his categorical imperative and of his God. But in spite of all this, the sceptical affirmation of Hume holds good. There is no way of proving the immortality of the soul rationally. There are, on the other hand, ways of proving rationally its mortality.