Ultimately, the exact identity of dehi/purusha/atma will always be elusive, not just because it defies objective measurement, but also because you and I experience reality very differently, and use different words to describe our experiences. What is dehi to you may not be dehi to me. Also, what I thought dehi was today may not be what I realize dehi is tomorrow. Initially, dehi may be the mind, then it becomes intelligence, then consciousness, then imagination, concept, meaning, then something else which defies language. But it exists. And that is the point.
