For thou, O Lord of hosts, God of Israel
 As he is called in ( 2 Samuel 7:26 ) : 
 hast revealed to thy servant;
 which he otherwise could not have known: 
 saying, I will build thee an house;
 see ( 2 Samuel 7:11 ) ; 
 therefore hath thy servant found in his heart to pray this prayer unto
 thee;
 found his heart disposed to this service, or found freedom and boldness in him to put up this prayer to God; what encouraged and emboldened him to do it was the gracious promise of God, that he would build up his family, and establish his kingdom; or otherwise he could not have taken such liberty, and used such boldness with God in prayer, as to have requested it of him.