God give me the serenity to accept things which cannot be changed;
Give me courage to change things which must be changed;
And the wisdom to distinguish one from the other.
Author unknown but used by Reinhold Niebuhr – http://www.bartleby.com/73/1472.html
Note from WikiPedia on the theologian Paul Tillich and ‘God as the Ground of being’;
Tillich described God
(spatially) as the “Ground of Being” and (temporally) as the “Eternal Now,” in tandem with the view that God is not an entity among entities but rather is “Being-Itself”—notions which Eckhart Tolle, for example, has invoked repeatedly ………were paradigmatically renovated by Tillich, although of course these ideas derive from Christian mystical sources as well as from ancient and medieval theologians such as St. Augustine and St. Thomas Aquinas