John Calvin's Commentary on the Bible - Psalms 51:10
Verse 10 10Create in me a clean heart, O God! In the previous part of the psalm David has been praying for pardon. He now requests that the grace of the Spirit, which he had forfeited, or deserved to have forfeited, might be restored to him. The two requests are quite distinct, though sometimes confounded together, even by men of learning. He passes from the subject of the gratuitous remission of sin to that of sanctification. And to this he was naturally led with earnest anxiety, by the... read more
Adam Clarke's Commentary on the Bible - Psalms 51:12
Restore unto me the joy of thy salvation - This is an awful prayer. And why? Because it shows he once Had the joy of God's salvation; and had Lost it by sin! Uphold me with thy free spirit - Prop me up; support me with a princely spirit, one that will not stoop to a mean or base act. See on Psalm 51:10 ; (note). read more