SANCTI AMBROSII, MEDIOLANENSIS EPISCOPI, DE SPIRITU SANCTO LIBRI TRES , AD GRATIANUM AUGUSTUM.

 LIBER PRIMUS.

 CAPUT PRIMUM.

 CAPUT II.

 CAPUT III.

 CAPUT IV.

 CAPUT V.

 CAPUT VI.

 617 CAPUT VII.

 CAPUT VIII.

 CAPUT IX.

 CAPUT X.

 CAPUT XI.

 CAPUT XII.

 CAPUT XIII.

 629 CAPUT XIV.

 CAPUT XV.

 CAPUT XVI.

 LIBER SECUNDUS.

 PROLOGUS.

 CAPUT PRIMUM.

 CAPUT II.

 CAPUT III.

 CAPUT IV.

 640 CAPUT V.

 643 CAPUT VI.

 CAPUT VII.

 CAPUT VIII.

 CAPUT IX.

 CAPUT X.

 656 CAPUT XI.

 CAPUT XII.

 CAPUT XIII.

 LIBER TERTIUS.

 665 CAPUT PRIMUM.

 CAPUT II.

 CAPUT III.

 CAPUT IV.

 CAPUT V.

 CAPUT VI.

 CAPUT VII.

 674 CAPUT VIII.

 CAPUT IX.

 CAPUT X.

 679 CAPUT XI.

 683 CAPUT XII.

 CAPUT XIII.

 CAPUT XIV.

 CAPUT XV.

 688 CAPUT XVI.

 690 CAPUT XVII.

 693 CAPUT XVIII.

 CAPUT XIX.

 CAPUT XX.

 CAPUT XXI.

 CAPUT XXII.

Chapter XIV.

Each Person of the Trinity is said in the sacred writings to be Light. The Spirit is designated Fire by Isaiah, a figure of which Fire was seen in the bush by Moses, in the tongues of fire, and in Gideon’s pitchers. And the Godhead of the same Spirit cannot be denied, since His operation is the same as that of the Father and of the Son, and He is also called the light and fire of the Lord’s countenance.

160. But why should I argue that as the Father is light, so, too, the Son is light, and the Holy Spirit is light? Which certainly pertains to the power of God. For God is Light, as John said: “For God is Light, and in Him is no darkness.”186    1 John i. 5.

161. But the Son, too, is Light, because “the Life was the Light of men.”187    S. John i. 8. And the Evangelist, that he might show that he was speaking of the Son of God, says of John the Baptist: “He was not light, but [was sent] to be a witness of the Light. That was the true Light, which lighteth every man that cometh into this world.”188    S. John i. 9. So, then, since God is Light, and the Son of God the true Light, without doubt the Son of God is true God.

162. And you find elsewhere that the Son of God is Light: “The people that sat in darkness and in the shadow of death have seen a great light.”189    Isa. ix. 2. But, which is still more clear, it is said: “For with Thee is the fount of Life, and in Thy light we shall see light,”190    Ps. xxxvi. [xxxv.] 9. which means that with Thee, O God the Father Almighty, Who art the Fount of Life, in Thy Son Who is the Light, we shall see the light of the Holy Spirit. As the Lord Himself shows, saying: “Receive ye the Holy Spirit,”191    S. John xx. 22. and elsewhere: “Virtue went out from Him.”192    S. Luke vi. 19.

163. But who can doubt that the Father is Light, when we read of His Son that He is the Brightness of eternal Light? For of Whom but of the Father is the Son the Brightness, Who both is always with the Father, and always shines, not with unlike but with the same radiance.

164. And Isaiah shows that the Holy Spirit is not only Light but also Fire, saying: “And the light of Israel shall be for a fire.”193    Isa. x. 17. So the prophets called Him a burning Fire, because in those three points we see more intensely the majesty of the Godhead; since to sanctify is of the Godhead, to illuminate is the property of fire and light, and the Godhead is wont to be pointed out or seen in the appearance of fire: “For our God is a consuming Fire,” as Moses said.194    Deut. iv. 24.

165. For he himself saw the fire in the bush, and had heard God when the voice from the flame of fire came to him saying: “I am the God of Abraham, and the God of Isaac, and the God of Jacob.”195    Ex. iii. 6. The voice came from the fire, and the voice was in the bush, and the fire did no harm. For the bush was burning but was not consumed, because in that mystery the Lord was showing that He would come to illuminate the thorns of our body, and not to consume those who were in misery, but to alleviate their misery; Who would baptize with the Holy Spirit and with fire, that He might give grace and destroy sin.196    S. Matt. iii. 11. So in the symbol of fire God keeps His intention.

166. In the Acts of the Apostles, also, when the Holy Spirit had descended upon the faithful, the appearance of fire was seen, for you read thus: “And suddenly there was a sound from heaven, as though the Spirit were borne with great vehemence, and it filled all the house where they were sitting, and there appeared unto them cloven tongues like as of fire.”197    Acts ii. 2, 3.

167. For the same reason was it that when Gideon was about to overcome the Midianites, he commanded three hundred men to take pitchers, and to hold lighted torches inside the pitchers, and trumpets in their right hands. Our predecessors have preserved the explanation received from the apostles, that the pitchers are our bodies, fashioned of clay, which know not fear if they burn with the fervour of the grace of the Spirit, and bear witness to the passion of the Lord Jesus with a loud confession of the Voice.

168. Who, then, can doubt of the Godhead of the Holy Spirit, since where the grace of the Spirit is, there the manifestation of the Godhead appears. By which evidence we infer not a diversity but the unity of the divine power. For how can there be a severance of power, where the effect of the working in all is one?

169. What, then, is that fire? Not certainly one made up of common twigs, or roaring with the burning of the reeds of the woods, but that fire which improves good deeds like gold, and consumes sins like stubble. This is undoubtedly the Holy Spirit, Who is called both the fire and light of the countenance of God; light as we said above: “The light of Thy countenance has been sealed upon us, O Lord.”198    Ps. iv. 6. What is, then, the light that is sealed, but that of the seal of the Spirit, believing in Whom, “ye were sealed,” he says, “with the Holy Spirit of promise.”199    Eph. i. 13.

170. And as there is a light of the divine countenance, so, too, does fire shine forth from the countenance of God, for it is written: “A fire shall burn in His sight.”200    Ps. l. [xlix.] 3. For the grace of the day of judgment shines beforehand, that forgiveness may follow to reward the service of the saints. O the great fulness of the Scriptures, which no one can comprehend with human genius! O greatest proof of the Divine Unity! For how many things are pointed out in these two verses!

629 CAPUT XIV.

Singulas Trinitatis personas e sacris codicibus lucem esse; Spiritum autem etiam ignem significari apud 0737A Esaiam, cujus quidem ignis in Moysis rubo, in linguis flammeis, et in lagenis Gedeonis figura exstitit. Negari non posse ejusdem Spiritus divinitatem, cum eadem sit ejus, quae Patris et Filii operatio, nec non Dominici vultus lumen ignisque praedicetur.

140. [Alias cap. XVI.] Quid autem astruam quod sicut Pater lumen, ita etiam Filius lumen, et Spiritus sanctus lumen est? Quod utique divinae potentiae est. Deus enim lux est, sicut dixit Joannes: Quia Deus lux est, et tenebrae in eo non sunt (I Joan. I, 5).

141. Lux autem et Filius, quia vita erat lux hominum. Et ut ostenderet se de Dei Filio Evangelista dixisse, ait de Joanne Baptista: Non erat ille lux, sed ut testimonium perhiberet de lumine. Erat lux vera, quae illuminat omnem hominem venientem in hunc mundum 0737B (Joan. I, 8, 9). Ergo quia Deus lux est, lux autem vera est Dei Filius: sine dubio Deus verus est Dei Filius.

142. Habes et alibi quia Filius Dei lux est: Populus qui sedebat in tenebris et in umbra mortis, lucem vidit magnam (Esai. IX, 2). Quid autem hoc evidentius, quod ait: Quoniam apud te est fons vitae, et in lumine tuo videbimus lumen (Psal. XXXV, 10)? Hoc est, quod apud te, Deus omnipotens Pater, qui fons vitae es, in lumine tuo Filio, lumen videbimus Spiritus sancti. Sicut ipse Dominus ostendit dicens: Accipite Spiritum sanctum (Joan. XX, 22); et alibi: Et virtus exibat de eo (Luc. VI, 19).

143. Ipsum autem Patrem quis dubitet lucem esse, cum lectum sit de Filio ejus quia splendor sit lucis aeternae (Hebr. I, 3)? Cujus enim nisi Patris aeterni 0737C splendor est Filius, qui et cum Patre semper est, nec dissimili, sed eadem claritate semper praefulget?

144. Et Esaias significat non solum lucem, sed etiam ignem esse Spiritum sanctum, dicens: Et erit lux Israel in ignem (Esai. X, 17). Itaque prophetae eum ignem ardentem dixerunt; quia in tribus istis generibus propensius majestatem divinitatis advertimus: quoniam et sanctificare, divinitatis; et illuminare, ignis et lucis est proprium: et in specie ignis exprimi vel videri divinae est consuetudinis: Deus enim est ignis consumens, sicut Moyses dixit (Deut. IV, 24).

145. Vidit enim ipse in rubo ignem, et audierat Deum, tunc quando vox facta est de flamma ignis ad eum dicens: Ego sum Deus Abraham, et Deus Isaac, et Deus Jacob (Exod. III, 15). Vox ergo de flamma, 0737D et in rubo flamma, et flamma non noxia. Urebatur enim rubus, et non exurebatur; eo quod illo mysterio Dominus figuraret quia illuminaturus spinas nostri corporis adveniret: nec consumpturus aerumnosos, sed mitigaturus aerumnas: qui baptizaret in 0738A Spiritu sancto et igni (Matth. III, 11); 630 ut gratiam tribueret, peccata consumeret. Ergo in specie ignis Deus servat propositum.

146. In Actibus quoque apostolorum cum supra fideles Spiritus sanctus descendisset, ignis species videbatur; sic enim habes: Et factus est subito de coelo sonus, tamquam vi magna Spiritus ferretur; et replevit totam domum, ubi erant sedentes: et visae sunt illis dispersae linguae tamquam ignis (Act. II, 2, 3).

147. Unde et illud quando Gedeon superaturus Madian, trecentos viros jussit hydrias sumere, et in hydriis faces accensas habere, et in dextris tenere tubas (Judic. VII, 16); ita nostri acceptum ab apostolis servavere majores, quod hydriae sunt corpora nostra, figurata de limo quae timere non norunt, si 0738B fervore gratiae spiritalis ignescant, et Jesu Domini passionem canora vocis confessione testentur.

148. Quis igitur de divinitate sancti Spiritus dubitet, cum ubi Spiritus gratia sit, ibi species divinitatis appareat? Quo testimonio non diversitatem, sed unitatem divinae colligimus potestatis. Nam quemadmodum potest esse discretio potestatis, ubi unus in omnibus operationis effectus est? Neque vero potest esse gratia sacramentorum, nisi ubi fuerit venia peccatorum.

149. Quis est igitur iste ignis? Non utique virgultis vilibus concretus, aut stipula silvarum fragosus incendiis: sed ignis ille, qui ut aurum bona facta meliorat, et ut stipulam peccata consumit. Hic est utique Spiritus sanctus, qui Dominici vultus et ignis 0738C appellatur et lumen: lumen, sicut supra diximus: Signatum est in nobis lumen vultus tui, Domine (Psal. IV, 7). Quod est ergo lumen signatum, nisi illius signaculi spiritalis, in quo credentes signati, inquit, estis Spiritu promissionis sancto (Ephes. I, 13)?

150. [Alias cap. XVII.] Et sicut lumen est vultus divini, ita etiam ignis emicat ex Dei vultu; quia scriptum est: Ignis in conspectu ejus ardebit (Psal. XLIX, 3). Praefulget enim gratia diei judicii, ut sequatur absolutio, quae sanctorum remuneretur obsequium. O magna abundantia Scripturarum, quam nemo possit humano ingenio comprehendere! O maximum divinae unitatis indicium! His enim duobus versiculis quam multa signantur!