Create in me a clean heart, O God; and renew a right spirit within me.
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Augustine of Hippo
15. "A clean heart create in me, O God" (ver. 10). "Create"-he meant to say, "as it were begin something new." But, because repentant he was praying (that had committed some sin, which before he had committed, he was more innocent), after what manner he hath said "create" he showeth. "And a right spirit renew in my inner parts." By my doing, he saith, the uprightness of my spirit hath been made old and bowed. For he saith in another Psalm, "They have bowed my soul." And when a man cloth make himself stoop unto earthly lusts, he is "bowed" in a manner, but when he is made erect for things above, upright is his heart made, in order that God may be good to him. For, "How good is the God of Israel to the upright of heart!" Moreover, brethren, listen. Sometimes God in this world chastiseth for his sin him that He pardoneth in the world to come. For even to David himself, to whom it had been already said by the Prophet, "Thy sin is put away," there happened certain things which God had threa...
Create. Hebrew bera, a term never used but for a new production. Whatever comes immediately from God must be pure, and as David had fallen into impurity, he earnestly implores this gift. He prays for the new heart of flesh, Ezechiel xxxvi. 26. (Haydock)
Thou hast said, Behold, I make all things new, Apocalypse xxi. Oh that I may be included, that I may sing a new canticle, having become a new man! (2 Corinthians v. 17., and Ephesians iv. 24.) (Berthier)
Right. Hebrew, "constant "(Haydock) the Holy Spirit, thy inspiration, or that uprightness, of which I have been deprived. (Calmet)
Bowels, or interior. (Worthington)
These sentiments ought to animate priests, when they hear confessions. (Worthington)