Bless the Lord, O my soul. Repeated in Psalms 103:2; also at the end of the psalm; and again in Psalms 104:1, Psalms 104:35. To "bless" is more than to praise; it is to praise with affection and gratitude.
The psalmist calls upon his own soul, and so on each individual soul, to begin the song of praise, which is to terminate in a general chorus of blessing from all creation (Psalms 104:20-22). And all that is within me.
"All my whole nature—intellect, emotion, feeling, sentiment—brain, heart, lungs, tongue," etc. Bless his holy Name; i.e. his manifested Personality, which is almost the same thing as himself.