359, as is clear from his own express testimony, and that of St. Jerom. In the first book of this immortal monument of his admirable genius and piety, he beautifully shows that man's felicity is only to be found in God; and that the light of reason suffices to demonstrate this, which he illustrates by an account of his own conversion to the faith. After this he takes notice, that we can learn only by God's revelation, his nature, or what he is, he being the competent witness of himself, who it known only by himself, (n. 18, p. 777.) In the second book he explains the Trinity, which we profess in the form of baptism, and says, that faith alone in believing, and sincerity and devotion in adoring, this mystery ought to suffice without disputing or prying, and laments, that by the blasphemies of the Sabellians and Arians, who perverted the true sense of the scriptures, he was compelled to dispute of things ineffable and incomprehensible which only necessity can excuse, (n. 25.) He then proves the eternal generation of the Son, the procession of the Holy Ghost, and their consubstantiality in one nature, (l. 2 and 3.) He checks their presumption in pretending to fathom the Trinity, by showing that they cannot understand many miracles of Christ or corporeal things, which yet they confess to be most certain, (l. 3, n. 19, 20, 24.) He detects and confutes the subtilties of the Arians, in their various confessions of faith, (l. 4, 5, 6,) also of the Sabellians and Photinians, (l. 7;) and demonstrates the divinity of Christ, from the confession of St. Peter, &c., (l. 6,) and of the very Jews, who were more sincere than the Arians, acknowledging that Christ called himself the natural Son of God. (John x. 31, &c. l. 7, n. 2, 3, p. 931.) The natural unity of the Father and Son, he demonstrates from that text, "I and my Father are one," and others, (l. 8,) and observes that both from the testimony of Christ in the holy scriptures, and from the faith of the church, we believe without doubting the Eucharist to be the true body and blood of Christ, (l. 8, n. 14, p. 955, 956.) He answers several objections from scripture, (l. 9,) and shows there was something in Christ (viz. the divine person, &c.) which did not suffer in his passion, (l. 10.) Other objections he confutes, (l. 11,) and in his last book defends the eternity of the Son of God. Between August in 358, and May in 359, St. Hilary, after he had been three years in banishment, and was still in Asia, published his book On Synods, to inform the Catholics in Gaul, Britain, and Germany, what judgment they ought to form of several synods, held lately in the East, chiefly by the Arians and Semi-Arians: a work of great use in the history of those times, and in which St. Hilary's prudence,