The LORD hath prepared his throne in the heavens; and his kingdom ruleth over all.
-Yahweh's kingdom ruleth over all, therefore let all praise Him, angels and men alike, especially the Psalmist's soul.
Verse 19. The Lord hath prepared his throne in the heavens - (Psalms 9:4; Psalms 9:7; Hebrews 1:11.) God's throne is infinitely above all earthly thrones.
And his kingdom ruleth over all. All the God-forgetting world- powers shall have at length to acknowledge this (Psalms 2:1-12; Psalms 47:2), as Nebuchadnezzar was obliged to do (Daniel 4:25; Daniel 4:34-35).
Verse 20. Bless the Lord, ye his angels - (Psalms 29:1-2). The angels' praises of God ought to stir up us men, still more favoured than angels, to praise Him.
That excel in strength - `that are mighty heroes in strength' ( giboreey (H1368) koach (H3581)).
Hearkening unto the voice of his word - obeying it (Deuteronomy 26:17). This distinguishes the angelic hosts from the unintelligent starry "hosts" (Psalms 103:21).
Verse 21. Bless ye the Lord, all ye his hosts ... that do his pleasure. The sun, moon, stars, and planets do His pleasure (Psalms 19:1) unconsciously; the "angels" consciously, and with instinctive love, "hearken unto the voice of His word" (Psalms 103:20). Both together constitute the Lord's "hosts" (Psalms 24:10).
Verse 22. Bless the Lord, O my soul. Thou who hast received so many and so great proofs of God's favour canst not be silent when all the rest of God's creatures praise Him. The psalm closes as it began (Psalms 103:1).