And when Moses came down from Mount Sinai with the two tablets of the Testimony in his hands, he was unaware that his face had become radiant from speaking with the LORD. — Exodus 34:29

Moses came down from the mountain with his face glowing, and he didn't even know it. The glory was a byproduct of being in God's presence, not something he worked up. Those closest to God are usually the last to notice anything special about themselves. The reflection of his glory is the unintended consequence of nearness.