The twentieth-century theologian Paul Tillich argued that God is not a being, even the highest, but the ground and power of being in everything that is. The idea echoes Eckhart’s Godhead and the ground of the soul, and Tillich drew openly on mystical sources. He spoke of faith as being grasped by ultimate concern.
Ground of Being
Paul Tillich’s phrase for God, not as one being among others but as being-itself.