The preceding considerations, which were unavoidably necessary in order to clear the ground, now enable me to indicate the true incentive which underlies all acts of real moral worth.

The seriousness, and indisputable genuineness, with which we shall find it is distinguished, removes it far indeed from the hair-splittings, subtleties, sophisms, assertions formulated out of airy nothings, and a priori soap-bubbles, which all systems up to the present have tried to make at once the source of moral conduct and the basis of Ethics. This incentive I shall not put forward as an hypothesis to be accepted or rejected, as one pleases; I shall actually prove that it is the only possible one. But as this demonstration requires several fundamental truths to be borne in mind, the reader's attention is first called to certain