He will not have the Ontological argument; but he asserts Natural Law, and relies upon the cosmological and design arguments - with various refinements and distinctions, differently stated in his two Summae.
As public penance finally decayed, and auricular confession took its place, these were superseded by the Summae de Poenitentia, - law-books in the strictest sense.
The scholastic systems are not the free products of speculation; in the main they are summae theologiae, or they are modified versions of Aristotle.
The book was undoubtedly the precursor of the famous Books of Sentences of Abelard's own pupil Peter Lombard and others, and of all the Summae theologiae with which the church was presently to abound.
The abstract law was to be found rather in the Summae of the canonists than in the decretals.