New Defender's Study Bible Notes
103:1 Bless the LORD. The exhortation to “bless the LORD” occurs six times in this psalm (verses l,2,20, 21,22). Men or angels can bless the Lord when they praise or thank Him, or—especially—when they worship Him (that is, obey His will). He blesses us with “life, and breath, and all things” (Acts 17:25), and it blesses Him when we “forget not all His benefits” (Psalm 102:2).
103:3 healeth. This promise has its primary fulfillment in our resurrection bodies, when all diseases will be cured forever, even the greatest disease, that of aging and dying itself.