1 The subject of our meditation in this present life should be the praises of God; for the everlasting exaltation of our life hereafter will be the praise of God, and none can become fit for the life hereafter, who has not practised himself for it now. So then now we praise God, but we pray to Him too. Our praise is marked by joy, our prayer by groans....On account of these two seasons, one, that which now is in the temptations and tribulations of this life, the other, that which is to be hereafter in everlasting rest and exultation; we have established also the celebration of two seasons, that before Easter and that after Easter. That which is before Easter signifies tribulation, in which we now are; that which we are now keeping after Easter, signifies the bliss in which we shall hereafter be. The celebration then which we keep before Easter is what we do now: by that which we keep after Easter we signify what as yet we have not. Therefore we employ that time in fastings and prayer, this present time we spend in praises, and relax our fast. This is the Halleluia which we sing, which, as you know, means (in Latin), Praise ye the Lord. Therefore that period is before the Lord's Resurrection, this, after His Resurrection: by which time is signified the future hope which as yet we have not: for what we represent after the Lord's Resurrection, we shall have after our own. For in our Head both are figured, both are set forth. The Baptism of the Lord sets forth to us this present life of trial, for in it we must toil, be harassed, and, at last, die; but the Resurrection and Glorification of the Lord sets forth to us the life which we are to have hereafter, when He shall come to recompense due rewards, evil to the evil, good to the good. And now indeed all the evil men sing with us, Halleluia; but, if they persevere in their wickedness, they may utter with their lips the song of our life hereafter; but the life itself, which will then be in the reality which now is typified, they cannot obtain, because they would not practise it before it came, and lay hold on what was to come.
2. “Halleluia.” “Praise the Lord,” you say to your neighbour, he to you: when all are exhorting each other, all are doing what they exhort others to do. But praise with your whole selves: that is, let not your tongue and voice alone praise God, but your conscience also, your life, your deeds. For now, when we are gathered together in the Church, we praise: when we go forth each to his own business, we seem to cease to praise God. Let a man not cease to live well, and then he ever praises God....It is impossible for a man's acts to be evil, whose thoughts are good. For acts issue from thought: nor can a man do anything or move his limbs to do anything, unless the bidding of his thought precede: just as in all things which you see done throughout the provinces, whatsoever the Emperor bids goes forth from the inner part of his palace throughout the whole Roman Empire. How great commotion is caused at one bidding by the Emperor as he sits in his palace! He but moves his lips, when he speaks: the whole province is moved, when what he speaks is being executed. So in each single man too, the Emperor is within, his seat is in the heart. If he be good and bids good things, good things are done: if he be bad and bids evil things, evil things are done. When Christ sits there, what can He bid, but what is good? When the devil is the occupant, what can he bid, but evil? But God has willed that it should be in your choice for whom you will prepare room, for God, or for the devil: when you have prepared it, he who is occupant will also rule. Therefore, brethren, attend not only to the sound; when you praise God, praise with your whole selves: let your voice, your life, your deeds, all sing.
3. “Praise ye the Lord from heaven”. As though he had found things in heaven holding their peace in the praise of the Lord, he exhorts them to arise and praise. Never have things in heaven held their peace in the praises of their Creator, never have things on earth ceased to praise God. But it is manifest that there are certain things which have breath to praise God in that disposition wherein God pleases them. For no one praises anything, save what pleases him. And there are other things which have not breath of life and understanding to praise God, but yet, because they also are good, and duly arranged in their proper order, and form part of the beauty of the universe, which God created, though they themselves with voice and heart praise not God, yet when they are considered by those who have understanding, God is praised in them; and, as God is praised in them, they themselves too in a manner praise God....
4. “Praise ye the Lord from heaven: praise Him in the high places.” First he says, “from heaven,” then from earth; for it is God that is praised, who made heaven and earth. All in heaven is calm and peaceful; there is ever joy, no death, no sickness, no vexation; there the blessed ever praise God; but we are still below: yet, when we think how God is praised there, let us have our heart there, and let us not hear to no purpose, “Lift up your hearts.” Let us lift up our heart above, that it become not corrupted on earth: for we take pleasure in what the Angels do there. We do it now in hope: hereafter we shall in reality, when we have come there. “Praise Him” then “in the high places.”
5. “Praise Him, all you angels of His, praise Him, all His powers”. “Praise Him, sun and moon; praise Him, all you stars and light”. “Praise Him, you heaven of heavens, and waters that are above the heavens”. “Let them praise the Name of the Lord”. When can he unfold all in his enumeration? Yet he has in a manner touched upon them all summarily, and included all things in heaven praising their Creator. And as though it were said to him, “Why do they praise Him? What has He conferred on them, that they should praise Him?” he goes on, “for He spoke, and they were made; He commanded, and they were created.” No wonder if the works praise the Worker, no wonder if the things that are made praise the Maker, no wonder if creation praise its Creator. In this Christ also is mentioned, though we seem not to have heard His Name....By what were they made? By the Word? How does he show in this Psalm, that all things were made by the Word? “He spoke, and they were made; He commanded, and they were created.” No one speaks, no one commands, save by word.
6. “He has established them for the age, and for age upon age”. All things in heaven, all things above, all powers and angels, a certain city on high, good, holy, blessed; from whence because we are wanderers, we are wretched; whither because we are to return, we are blessed in hope; whither when we shall have returned, we shall be blessed indeed; “He has given them a law which shall not pass away.” What sort of command, think ye, have things in heaven and the holy angels received? What sort of command has God given them? What, but that they praise Him? Blessed are they whose business is to praise God! They plough not, they sow not, they grind not, they cook not; for these are works of necessity, and there is no necessity there. They steal not, they plunder not, they commit no adultery; for these are works of iniquity, and there is no iniquity there. They break not bread for the hungry, they clothe not the naked, they take not in the stranger, they visit not the sick, they set not at one the contentious, they bury not the dead; for these are works of mercy, and there there is no misery, for mercy to be shown to. O blessed they! Think we that we too shall be like this? Ah! let us sigh, let us groan in sighing. And what are we, that we should be there? Mortal, outcast, abject, earth and ashes! But He, who has promised, is almighty....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)