1-4. A plea for mercy is a confession of guilt.
blot out--as from a register.
transgressions--literally, "rebellions" ( Psalms 19:13 , 32:1 ).
2. Wash me--Purity as well as pardon is desired by true penitents.
3. For . . . before me--Conviction precedes forgiveness; and, as a gift of God, is a plea for it ( 2 Samuel 12:13 , Psalms 32:5 , 1 John 1:9 ).
4. Against thee--chiefly, and as sins against others are violations of God's law, in one sense only.
that . . . judgest--that is, all palliation of his crime is excluded; it is the design in making this confession to recognize God's justice, however severe the sentence.
5, 6. His guilt was aggravated by his essential, native sinfulness, which is as contrary to God's requisitions of inward purity as are outward sins to those for right conduct.
6. thou shalt make, &c.--may be taken to express God's gracious purpose in view of His strict requisition; a purpose of which David might have availed himself as a check to his native love for sin, and, in not doing so, aggravated his guilt.
truth . . . and . . .wisdom--are terms often used for piety (compare Job 28:28 , Psalms 119:30 ).
7-12. A series of prayers for forgiveness and purifying.
Purge . . . hyssop--The use of this plant in the ritual ( Exodus 12:22 , Numbers 19:6 Numbers 19:18 ) suggests the idea of atonement as prominent here; "purge" refers to vicarious satisfaction ( Numbers 19:17-20 ).
8. Make . . . joy--by forgiving me, which will change distress to joy.
9. Hide, &c.--Turn from beholding.
10. Create--a work of almighty power.
in me--literally, "to me," or, "for me"; bestow as a gift, a heart free from taint of sin ( Psalms 24:4 , 73:1 ).
renew--implies that he had possessed it; the essential principle of a new nature had not been lost, but its influence interrupted ( Luke 22:32 ); for Psalms 51:11 shows that he had not lost God's presence and Spirit ( 1 Samuel 16:13 ), though he had lost the "joy of his salvation" ( Psalms 51:12 ), for whose return he prays.
right spirit--literally, "constant," "firm," not yielding to temptation.
12. free spirit--"thy" ought not to be supplied, for the word "free" is, literally, "willing," and "spirit" is that of David. "Let a willing spirit uphold me," that is, with a soul willingly conformed to God's law, he would be preserved in a right course of conduct.
13. Then--Such will be the effect of this gracious work.
ways--of providence and human duty ( Psalms 18:21 Psalms 18:30 , 32:8 , Luke 22:32 ).
14. Deliver--or, "Free me" ( Psalms 39:8 ) from the guilt of murder ( 2 Samuel 12:9 2 Samuel 12:10 , Psalms 5:6 ).
righteousness--as in Psalms 7:17 , 31:1 .
15. open . . . lips--by removing my sense of guilt.
16. Praise is better than sacrifice ( Psalms 50:14 ), and implying faith, penitence, and love, glorifies God. In true penitents the joys of pardon mingle with sorrow for sin.
18. Do good, &c.--Visit not my sin on Thy Church.
build . . . walls--is to show favor; compare Psalms 89:40 , for opposite form and idea.
19. God reconciled, material sacrifices will be acceptable ( Psalms 4:5 ; compare Isaiah 1:11-17 ).