10 Come, my brethren; if we ask how these were punished, the Lord will aid me to tell you. Let us consider these three persons, Moses, Aaron, and Samuel: and how they were punished, since he said, “You have punished all their own affections:” meaning those affections of theirs, which the Lord knew in their hearts, which men knew not. For they were living in the midst of the people of God, without complaint from man. But what do we say? That perhaps the early life of Moses was sinful; for he fled from Egypt, after slaying a man. The early life of Aaron also was such as would displease God; for he allowed a maddened and infatuated people to make an idol to worship; and an idol was made for God's people to worship. What sin did Samuel, who was given up when an infant to the temple? He passed all his life amid the holy sacraments of God: from childhood the servant of God. Nothing was ever said of Samuel, nothing by men. Perhaps God knew of somewhat there to chasten; since even what seems perfect unto men, unto that Perfection is still imperfect. Artists show many of their works to the unskilful; and when the unskilful have pronounced them perfect, the artists polish them still further, as they know what is still wanting to them, so that men wonder at things they had imagined already perfect having received so much additional polish. This happens in buildings, and in paintings, and in embroidery, and almost in every species of art. At first they judge it to be already in a manner perfect, so that their eyes desire nothing further: but the judgment of the inexperienced eye is one, and that of the rule of art another. Thus also these Saints were living before the eyes of God, as if faultless, as if perfect, as if Angels: but He who punished all their own affections, knew what was wanting in them. But He punished them not in anger, but in mercy: He punished them that He might perfect what He had begun, not to condemn what He had cast away. God therefore punished all their affections. How did He punish Samuel? where is this punishment?...What was said unto Moses was a type, not a punishment. What punishment is death to an old man? What punishment was it, not to enter into that land, into which unworthy men entered? But what is said of Aaron? He also died an old man: his sons succeeded him in the priesthood: his son afterwards ruled in the priesthood: how did He punish Aaron also? Samuel also died a holy old man, leaving his sons as his successors. I seek for the punishment inflicted upon them, and according to men I find it not: but according to what I know the servants of God suffer every day, they were day by day punished. Read ye, and see the punishments, and you also who are advanced bear the punishments. Every day they suffered from the obstinate people, every day they suffered from the ungodly livers; and were compelled to live among those whose lives they daily censured. This was their punishment. He unto whom it is small has not advanced far; for the ungodliness of others torments you in proportion as you have departed far from your own....
11. “O magnify the Lord our God!”. Again we magnify Him. He who is merciful even when He strikes, how is He to be praised, how is He to be magnified? Can you show this unto your son, and cannot God? For you are not good when thou dost caress your son, and evil when you strike him. Both when thou dost caress him you are a father, and when you strike him, you are his father: thou dost caress him, that he may not faint; you strike him, that he may not perish. “O magnify the Lord our God, and worship Him upon His holy hill: for the Lord our God is holy.” As he said above, “O magnify the Lord our God and fall down before His footstool:” now we have understood what it is to worship His footstool: thus also but now after he had magnified the Lord our God, that no man might magnify Him apart from His hill, he has also praised His hill. What is His hill? We read elsewhere concerning this hill, that a stone was cut from the hill without hands, and shattered all the kingdoms of the earth, and the stone itself increased. This is the vision of Daniel which I am relating. This stone which was cut from the hill without hands increased, and “became,” he says, “a great mountain, and filled the whole face of the earth.” Let us worship on that great mountain, if we desire to be heard. Heretics do not worship on that mountain, because it has filled the whole earth; they have stuck fast on part of it, and have lost the whole. If they acknowledge the Catholic Church, they will worship on this hill with us. For we already see how that stone that was cut from the mountain without hands has increased, and how great tracts of earth it has prevailed over, and unto what nations it has extended. What is the mountain whence the stone was hewn without hands? The Jewish kingdom, in the first place; since they worshipped one God. Thence was hewn the stone, our Lord Jesus Christ....That stone then was born of the mountain without hands: it increased, and by its increase broke all the kingdoms of the earth. It has become a great mountain, and has filled the whole face of the earth. This is the Catholic Church, in whose communion rejoice that you are. But they who are not in her communion, since they worship and praise God apart from this same mountain, are not heard unto eternal life; although they may be heard unto certain temporal things. Let them not flatter themselves, because God hears them in some things: for He hears Pagans also in some things. Do not the Pagans cry unto God, and it rains? Wherefore? Because He makes His sun to rise over the good and the bad, and sends rain upon the just and the unjust. Boast not therefore, Pagan, that when you cry unto God, God sends rain, for He sends rain upon the just and the unjust. He has heard you in temporal things: He hears you not in things eternal, unless you have worshipped in His holy hill. “Worship Him upon His holy hill: for the Lord our God is holy.”...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)