Bhagavad Gita, Chapter 13, Verse 28

He sees, who sees the Lord Supreme, existing equally in all beings, deathless in the dying.

Real, clear sight is defined here specifically, seeing the second, quieter presence alongside the soul, not just the soul alone.

Krishna names this dual recognition as what actually counts as seeing truly. Missing that second presence, even while aware of the soul, is treated as an incomplete kind of sight.