What can David say more unto thee? either, first, In way of gratitude and praise to thee; words cannot express my obligations to thee, nor my sense of these obligations. Or rather, secondly, In way of prayer, as appears by the parallel place, 1 Chronicles 17:18. What can I ask or desire of thee more than thou hast freely done? Thou knowest thy servant; thou knowest, either, first, my deep sense of thy favours, and my obligations to thee; or rather, secondly, my condition and necessities, what I do or may need hereafter; and as thou knowest this, so I doubt not thou wilt be ready to supply me accordingly. Compare Matthew 6:8,32.
Related Commentaries of 2 Samuel 7:20
2 Samuel 7:20
20 And what can David say more unto thee? for thou, Lord GOD, knowest thy servant.