These two phrases mean basically the same thing and emphasize how much he will praise Yahweh. Alternate translation: "I will praise Yahweh with all that I am" (See: [[rc://en/ta/man/translate/figs-parallelism]])
"all of me" or "all that I am." David uses this phrase to refer to himself and to emphasize his devotion to Yahweh. (See: [[rc://en/ta/man/translate/figs-synecdoche]])