Vultures soar into the blue until they are invisible, mounting in a spiral, but never moving their wings. Their outspread wings, while motionless, are kept adjusted to the upper currents of air in such a way that they are lifted ever higher…. Prayer is adjusting the personality to God in such a way that God can work more potently for good than he otherwise could, as the outstretched wings of a bird enable the rising currents to carry it to higher levels. —Henry Nelson Wieman and Regina Westcott-Wieman (1935)