If you’ve ever wondered why some Christians raise their hands in worship, this is the best explanation I’ve ever read. This is from Patrick Henry Reardon’s Christ in the Psalms. He’s commenting on the opening of Psalm 41: “Let my prayer rise before you as incense, the lifting of my hands as the evening sacrifice.”
Whenever, then, we Christians raise our hands in prayer, as St. Paul tells us to do (cf. 1 Tim 2:8), it is to symbolize that our prayer, our entire relationship to God, is founded in the power of the Cross. We are thereby proclaiming that we have no access to God except through the Cross of the Lord. The raising of our hands in prayer is acceptable to God only because of its relationship to that true evening sacrifice through which we draw near.