Albert Barnes Commentary Psalms 63:4

"So will I bless thee while I live: I will lift up my hands in thy name." — Psalms 63:4 (ASV)

Thus will I bless thee while I live - In my life; or, as long as life lasts, I will praise you. The word “thus” refers to the sentiment in the previous verse, meaning that as a result of his deep sense of the value of the loving kindness of God, he would praise him through all the rest of his life, or would never cease to praise him. A true purpose of serving God embraces the whole of this life, and the whole of eternity. He who loves God, and who has any proper sense of his mercy, does not anticipate a time when he will stop praising and blessing him, or when he will have any desire or wish not to be engaged in his service.

I will lift up my hands in thy name - In solemn prayer and praise. See the notes at Psalms 28:2.