Psalms 48:9

God's true temple is the body of Christ, and in that body lies the purification of all our sins. Truly, that flesh is God's temple, and in it there is no contagion of sin. On the contrary, it was itself the sacrifice that takes away the sin of all the world. That flesh is indeed God's temple, and in it shone God's image. In it there dwelled the fullness of divinity in a bodily manner, for Christ is himself that fullness.… In that temple, the psalmist tells us, "we have received your mercy." … Just as Christ is redemption, so too he is mercy. No greater mercy can there be than that he should offer himself as a victim for our crimes. He sacrificed himself to wash the world clean in his blood, for in no other way could our sin be abolished.

"We have received Thy mercy, O God, in the midst of Thy people" (ver. 8). Who have received, and where received? Hath not the same Thy people received Thy mercy. If Thy people hath received Thy mercy, how then, "in the midst of Thy people"? As if they who received were one party, they in the midst of whom they received another. A great mystery, but yet well known. When hence also, that is, out of these verses, hath been extracted and brought forth what ye know; it will be not ruder, but sweeter. Now forsooth all are reckoned the people of God, who carry His Sacraments, but not all belong to His Mercy. All forsooth receiving the Sacrament of the Baptism of Christ, are called Christians, but not all live worthily of that Sacrament. There are some of whom saith the Apostle, "Having a form of godliness, but denying the power thereof." Yet on account of this form of godliness they are named among God's people. As to the floor, until the corn is threshed, belongs not the wheat only, but the chaff. But will it also belong to the garner? In the midst then of an evil people is a good people, which hath received the Mercy of God. He liveth worthily of the Mercy of God who heareth, and holdeth, and doeth what the Apostle saith, "We beseech you that ye receive not the Grace of God in vain." Whoso then receiveth not the Grace of God in vain, the same receiveth not only the Sacrament, but also the Mercy of God as well....So those who have the Sacraments, and have not good manners, are both said to be of God, and not of God; are both said to be His, and to be strangers: His because of His own Sacraments, strangers because of their own vice. So also strange daughters: daughters, because of the form of godliness; strange, because of their loss of virtue. Be the lily there; let it receive the Mercy of God: hold fast the root of a good flower, be not ungrateful for soft rain coming from heaven. Be thorns ungrateful, let them grow by the showers: for the fire they grow, not for the garner. In the midst of Thy people not receiving Thy mercy, we have received Thy mercy. For "He came unto His own, and His own received Him not," yet, in the midst of them, "as many as received Him, to them gave He power to become the sons of God."...