Grant thee according to thine own heart, and fulfil all thy counsel.
Ver. 4. Grant thee according to thine own heart] David's heart was according to God's heart (otherwise this had not been a warrantable petition), and therefore might say (and the people on his behalf), as once Luther did, Fiat voluntas mea; mea, Domine, quia tua, Let my will be done; mine I say, Lord, because the same with thine.
And fulfil all thy counsel] Answer thee, ad cardinem desiderii, as a Father expresseth it (Aug. Confess. l. 5, c. 8). Let it be unto thee even as thou wilt. Sometimes God doth not only grant a man's prayer, but fulfilleth his counsel; that is, in that very way, by that very means, which his judgment pitch upon in his thoughts.