Augustine on Psalm XXIX
ALMIGHTY and everlasting God, who hast given unto us thy servants grace, by the confession of a true faith, to acknowledge the glory of the eternal Trinity, and in the power of the Divine Majesty to worship the Unity; We beseech thee that thou wouldest keep us stedfast in this faith, and evermore defend us from all adversities, who livest and reignest, one God, world without end. Amen.
Genesis XVIII., Psalms 29, 33 | 93, 97, 150 , Revelation iv. 1 & St. John iii. 1
Admonition and Exhortation for Communion
Homily of Augustine on Psalm XXIX
Angels at Mamre (Holy Trinity) Rublev
And the LORD appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day; And he lift up his eyes and looked, and, lo, three men stood by him: and when he saw them, he ran to meet them from the tent door, and bowed himself toward the ground, And said, My Lord, if now I have found favour in thy sight, pass not away, I pray thee, from thy servant: Let a little water, I pray you, be fetched, and wash your feet, and rest yourselves under the tree: And I will fetch a morsel of bread, and comfort ye your hearts; after that ye shall pass on: for therefore are ye come to your servant. And they said, So do, as thou hast said.
Psalms 29, 33, 93, 97, 150
Revelation iv. 1.
AFTER this I looked, and, behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will shew thee things which must be hereafter. And immediately I was in the spirit: and, behold, a throne was set in heaven, and one sat on the throne. And he that sat was to look upon like a jasper and a sardine stone: and there was a rainbow round about the throne, in sight like unto an emerald. And round about the throne were four and twenty seats: and upon the seats I saw four and twenty elders sitting, clothed in white raiment; and they had on their heads crowns of gold. And out of the throne proceeded lightnings and thunderings and voices: and there were seven lamps of fire burning before the throne, which are the seven Spirits of God. And before the throne there was a sea of glass like unto crystal: and in the midst of the throne, and round about the throne, were four living creatures full of eyes before and behind. And the first was like a lion, and the second like a calf, and the third had a face as a man, and the fourth was like a flying eagle. And the four living creatures had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come. And when those living creatures give glory and honour and thanks to him that sat on the throne, who liveth for ever and ever, the four and twenty elders fall down before him that sat on the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying, Thou art worthy, O Lord, to receive glory and honour and power: for thou hast created all things, and for thy pleasure they are, and were created.
St. John iii. 1
THERE was a man of the Pharisees, named Nicodemus, a ruler of the Jews: the same came to Jesus by night, and said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these miracles that thou doest, except God be with him. Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God. Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother's womb, and be born? Jesus answered, Verily, verily, I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. Marvel not that I said unto thee, Ye must be born again. The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit. Nicodemus answered and said unto him, How can these things be? Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things? Verily, verily, I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. If I have told you earthly things, and ye believe not, how shall ye believe, if I tell you of heavenly things? And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven. And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: that whosoever believeth in him should not perish, but have eternal life.
A psalm of David himself, of the consummation of the tabernacle.
1. A Psalm of the Mediator Himself, strong of hand, of the perfection of the Church in this world, where she wars in time against the devil.
2. The Prophet speaks, "Bring unto the Lord, O ye Sons of God, bring unto the Lord the young of rams" (ver. 1). Bring unto the Lord yourselves, whom the Apostles, the leaders of the flocks, have begotten by the Gospel.  "Bring unto the Lord glory and honour" (ver. 2). By your works let the Lord be glorified and honoured. "Bring unto the Lord glory to His name." Let Him be made known gloriously throughout the world. "Worship the Lord in His holy court." Worship the Lord in your heart enlarged and sanctified. For ye are His regal holy habitation.
3. "The Voice of the Lord is upon the waters" (ver. 3). The Voice of Christ is upon the peoples. "The God of majesty hath thundered." The God of majesty, from the cloud of the flesh, hath awfully preached repentance. "The Lord is upon many waters." The Lord Jesus Himself, after that He sent forth His Voice upon the peoples, and struck them with awe, converted them to Himself, and dwelt in them.
4. "The Voice of the Lord is in power" (ver. 4). The Voice of the Lord now in them themselves, making them powerful. "The Voice of the Lord is in great might." The Voice of the Lord working great things in them.
5. "The Voice of the Lord breaking the cedars" (ver. 5). The Voice of the Lord humbling the proud in brokenness of heart. "The Lord shall break the cedars of Libanus." The Lord by repentance shall break them that are lifted on high by the splendour of earthly nobility, when to confound them He shall have "chosen the base things of this world,"  in the which to display His Divinity.
6. "And shall bruise them as the calf of Libanus" (ver. 6). And when their proud exaltation hath been cut off, He will lay them low after the imitation of His Own humility, who like a calf was led to slaughter  by the nobility of this world. "For the kings of the earth stood up, and the rulers agreed together against the Lord, and against His Christ."  "And the Beloved is as the young of the unicorns." For even He the Beloved, and the Only One of the Father, "emptied Himself" of His glory; and was made man,  like a child of the Jews, that were "ignorant of God's righteousness,"  and proudly boasting of their own righteousness as peculiarly theirs.
7. "The Voice of the Lord cutting short the flame of fire" (ver. 7). The Voice of the Lord, without any harm to Himself, passing through all the excited ardour of them that persecute Him, or dividing the furious rage of His persecutors, so that some should say, "Is not this haply the very Christ;" others, "Nay; but He deceiveth the people:"  and so cutting short their mad tumult, as to pass some over into His love, and leave others in their malice.
8. "The Voice of the Lord moving the wilderness" (ver. 8). The Voice of the Lord moving to the faith the Gentiles once "without hope, and without God in the world;"  where no prophet, no preacher of God's word, as it were, no man had dwelt. "And the Lord will move the desert of Cades." And then the Lord will cause the holy word of His Scriptures to be fully known, which was abandoned by the Jews who understood it not.
9. "The Voice of the Lord perfecting the stags"  (ver. 9). For the Voice of the Lord hath first perfected them that overcame and repelled the envenomed tongues.  "And will reveal the woods." And then will He reveal to them the darknesses of the Divine books, and the shadowy depths of the mysteries, where they feed with freedom. "And in His temple doth every man speak of His glory." And in His Church all born again to an eternal hope praise God, each for His own gift, which He hath received from the Holy Spirit.
10. "The Lord inhabiteth the deluge" (ver. 10). The Lord therefore first inhabiteth the deluge of this world in His Saints, kept safely in the Church, as in the ark. "And the Lord shall sit a King for ever." And afterward He will sit reigning in them for ever.
11. "The Lord will give strength to His people"  (ver. 11). For the Lord will give strength to His people fighting against the storms and whirlwinds of this world, for peace in this world He hath not promised them.  "The Lord will bless His people in peace." And the same Lord will bless His people, affording them peace in Himself; for, saith He, "My peace I give unto you, My peace I leave with you." 
Notes:  1 Cor. iv. 15.  1 Cor. i. 28.  Isa. liii. 7.  Ps. ii. 2.  Phil. ii. 7.  Rom. x. 3.  John vii. 41, 12.  Eph. ii. 12.  [Jerome's Hebraic version reads, Vox Domini obstetricans cervas, which the Authorized English follows.--C.]  Plin. Hist. Nat. viii. 32 and xxviii. 9 says, that they bring serpents out of their holes with their breath, and kill and eat them. See S. Greg. Mor. xxx. 36.  [This Psalm was referred to Pentecost by the Jews, and to the giving of the law. Heb. xii. 18-21.--C.]  John xvi. 33.  John xiv. 27.