magined that the
mystical benediction is lost if the eucharist is kept to another day;
but says, "they are mad; for Christ is not altered, nor his body
changed." (T. 6, p. 365, ep. ad Calosyrium.) In his fourth book on St.
John, (t. 4, p. 358,) he as expressly confutes the Jewish doubt about
the possibility of the holy sacrament, as if he had the modern
Sacramentarians in view.

To refute the whole system of Arianism, he wrote the book which he
called The Treasure, which he divided into thirty-five titles or
sections. He answers in it all the objections of those heretics, and
establishes from scripture the divinity of the Son of God; and from
title thirty-three, that of the Holy Ghost.

His book On the Holy and Consubstantial Trinity, consists of seven
dialogues, and was composed at the request of Nemesm and Hermias. This
work was also written to prove the consubstantiality of Christ, but is
more obscure than the former. The holy doctor added two other Dialogues,
the eighth and ninth, On the Incarnation, against the errors of
Nestorius, then only known by report at Alexandria. He afterwards
subjoined Scholia, to answer certain objections; likewise a short book
On the Incarnation, in which he proves the holy Virgin to be, as she is
called, the Mother of God; as Jesus Christ is at the same time both the
Son of God, and the Son of man. By his skirmishes with the Arians he was
prepared to oppose and crush the extravagances of Nestorius, broached at
that time against the same adorable mystery of the Incarnation, of which
God raised our holy doctor the champion in his church; for by his
writings he both stifled the heresy of Nestorius in the cradle, and
furnished posterity with arms against that of Eutyches, says Basil of
Seleucia. (T. 4, Conc. p. 925.)

St. Cyril composed at Ephesus his three treatises On the Right Faith,
against Nestorius. The first is addressed to the Emperor Theodosius. It
contains an enumeration of the heresies against the Incarnation, namely,
of Cerinthus, Photinus, Apollinaris, and Nestorius, with a refutation of
each, especially the last. The second is inscribed to the princesses
Pulcheria, Arcadia, and Marina, the emperor's sisters, all virgins,
consecrated to God. This contains the proofs of the Catholic faith
against Nestorius. The third is a confutation of the heretics'
objections against it.

His five books against Nestorius, are the neatest and best penned of his
polemic writings. They cont