Psalms 99:9

"O magnify the Lord our God!" (ver. 9). Again we magnify Him. He who is merciful even when He striketh, how is He to be praised, how is He to be magnified? Canst thou show this unto thy son, and cannot God? For thou art not good when thou dost caress thy son, and evil when thou strikest him. Both when thou dost caress him thou art a father, and when thou strikest him, thou art his father: thou dost caress him, that he may not faint; thou strikest 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 hath 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 saith, "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 hath 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 hath increased, and how great tracts of earth it hath prevailed over, and unto what nations it hath 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 hath become a great mountain, and hath filled the whole face of the earth. This is the Catholic Church, in whose communion rejoice that ye 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 heareth them in some things: for He heareth Pagans also in some things. Do not the Pagans cry unto God, and it raineth? Wherefore? Because He maketh His sun to rise over the good and the bad, and sendeth rain upon the just and the unjust. Boast not therefore, Pagan, that when thou criest unto God, God sendeth rain, for He sendeth rain upon the just and the unjust. He hath heard thee in temporal things: He heareth thee not in things eternal, unless thou hast worshipped in His holy hill. "Worship Him upon His holy hill: for the Lord our God is holy."...