Psalms 103:22

Bless the Lord, all his works, in all places of his dominion,
&c.] Which some interpret of all his creatures, animate or inanimate, rational or irrational, throughout the whole world, which is all under his government; and who all of them, objectively, bless and praise the Lord, ( Psalms 148:7-13 ) . Or rather regenerate persons, his sons and daughters, the work of his hand, in each of the parts of the world where they live, are here called upon to bless the Lord; who, of his abundant mercy, hath begotten them again to a glorious inheritance: these are his workmanship in Christ; formed for himself, his service, and glory; and are under the highest obligations to show forth his praise.

Bless the Lord, O my soul:
thus the psalmist ends the psalm as he begun it; not excusing himself by what he had done, nor by calling upon others to this service; knowing that this is constant employment for time and eternity; a work in which he delighted, and was desirous of being concerned in, now and for ever.