Psalms 103:20-22

Verse 20

Bless the Lord, ye his angels - Every person who has a sense of God's goodness to his soul feels his own powers inadequate to the praise which he ought to offer; and therefore naturally calls upon the holiest of men, and the supreme angels, to assist him in this work.

That excel in strength - Some take גברי כה gibborey coach the mighty in strength, for another class of the hierarchy, - they that do his commandments, hearkening to his words; and consider them to be that order of beings who are particularly employed in operations among and for the children of men; probably such as are called powers in the New Testament.
Verse 21

All ye his hosts; ye ministers of his - We know almost nothing of the economy of the heavenly host; and, therefore, cannot tell what is the difference between angels, mighty powers, hosts, and ministers who do his pleasure. All owe their being and all its blessings to God; all depend upon his bounty; and without him they can do nothing; therefore, all should praise him.
Verse 22

Bless the Lord, all his works - Let every thing he has done be so considered as to show forth his praise.

Bless the Lord, O my soul - Let me never forget my obligation to his mercy; for with tender mercies and loving-kindness has he crowned me. I will therefore be thankful unto him, and speak good of his name.

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