ground of being, n.All

Ground of being (n.) cannot ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠be grasped by conceptual thought — like eyes trying to look at themselves, or describing the color of a mirror by what it reflects.

Ground of being (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠what man feels all things are "on," as reflections are on a mirror or the words of a song are in the singer.