Augustus
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I appreciate the frustration of atheists who want a clear definition of God. The problem is, there can't be one. The idea of God comes from the sense of awe and mystery we have when we look out over the universe. We label the source of that "God." But define? The whole point is that he/she/it is something that defies our understanding, that cannot be held within words. Perhaps the Tao Te Ching captures what cannot be captured: "Something there is..."
Or Wittgenstein's "Whereof one cannot speak, thereof one must be silent".
Sort of like if you experience a sense of awe witnessing a beautiful natural environment, your description of this will never be able to recreate the same sense in others. The wordless intuitive appreciation of what you feel will always be more meaningful/profound that the verbal description.