Title IV: On the Human Act as Moral

The usefulness of this title, since it concerns the knowing of a thing which is so much ours that from it our discipline draws its name, does not need to be demonstrated. The considerations to be made are truly essential.

Distribution of the title into parts. We must treat successively three matters of great moment: 1. An accurate notion of morality must be handed down. 2. How widely morality extends must be investigated. 3. The sources of morality, with the proper force of each, must be indicated.