Commentaries:
Adam Clarke
Create in me a clean heart - Mending will not avail; my heart is altogether corrupted; it must be new made, made as it was in the beginning. This is exactly the sentiment of St. Paul: Neither circumcision availeth any thing, nor uncircumcision, but a new creation; and the salvation given under the Gospel dispensation is called a being created anew in Christ Jesus.
A right spirit within me - ruach nachon , a constant, steady, determined spirit; called Psalms 51:12, ruach nedibah , a noble spirit. a free, generous, princely spirit; cheerfully giving up itself to thee; no longer bound and degraded by the sinfulness of sin.
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