This psalm is a psalm of praise. It calls for praise and gives reasons why this praise is due.
But, who is the psalmist addressing?
The psalm begins "Bless the Lord, O my soul, and all that is within me." When I pray this psalm, I am calling on myself to pray with my total being--not just part of me but all of me. And I repeat--I am telling me to do that.
John Goldingay in his Old Testament Theology, Volume 3, points out that this psalm assumes we can argue with ourselves and that we may need to stir ourselves up to that praise that is due the Lord.
These verses provide us with a reminder of what God does that makes us so thankful: forgives, heals, rescues, loves, satisfies, vindicates.