Prayer lays hold of God's plan and becomes the link between His will and its accomplishment on earth. Amazing things happen, and we are given the privilege of being the channels of the Holy Spirit's prayer.
One does not surrender a life in an instant. That which is lifelong can only be surrendered in a lifetime. Nor is surrender to the will of God (per se) adequate to fullness of power in Christ. Maturity is the accomplishment of years, and I can only surrender to the will of God as I know what that will is.
Action that is clearly right needs no justification.