Here, 1. David applies to God for grace and comfort with much
solemnity. He begs of God to hear his voice: "Lord, I have something to
say to thee; shall I obtain a gracious audience?" Well, what has he to
say? What is his petition and what is his request? It is not long, but
it has much in a little: "Lord, quicken me; stir me up to that which is
good, and make me vigorous, and lively, and cheerful in it. Let habits
of grace be drawn out into act." 2. He encourages himself to hope that
he shall obtain his request; for he depends, (1.) Upon God's
lovingkindness: "He is good, therefore he will be good to me, who hope
in his mercy. His lovingkindness manifested to me will help to quicken
me, and put life into me." (2.) Upon God's judgment, that is, his
wisdom ("He knows what I need, and what is good for me, and therefore
will quicken me"), or his promise, the word which he has spoken, mercy
secured by the new covenant: Quicken me according to the tenour of that
covenant.