"Thy will be done". Does that sound strange to you that Jesus would tell us to include that phrase in our prayers? We don't really need to remind God that His will should prevail. So that cannot be the reason. Jesus did tell us that we will receive anything we ask for in His name. Perhaps we need to say it to remind ourselves that when we pray and ask for certain things to happen in our lives, that they will be done ONLY if our will and God's will are in sync. James makes that point when he answers the question of some followers who remembered Christ's promise but were not receiving the answer to their prayers that they expected. James 4:3 You ask and do not receive, because you ask amiss, that you may spend it on your pleasures. Remember, His will must prevail.