When we say that thou art, we give up the contradictory aspects. These are contradictory things. You cannot have them at the same time. If you do not er take it to be an appearance, you cannot ignore them. It's like watching two movies on a screen: One is a tragedy and one is a comedy. The underlying reality of both? Through one individual a body mind, becomes tam through the cosmic maya cosmic mind,. Cosmic body is the tut you. Take the only one part of the common suns from each pot - then you can say, what is the reality of the nine parts of the real world? What is the true meaning of all these words? I don
Sage Uddalaka asks his son Svetaketu: What is that knowledge by which we hear the unhearable, perceive what cannot be perceived and know what cannot be known? Inspired from this story from the Chandogya Upanishad, Swami Sarvapriyananda teaches the great saying (mahavakya) - Tat Tvam Asi (That Thou Art).
This discourse is also inspired from a verse from the Brihadharanyaka Upanishad (Mantra 4.4.12) as taught in the book, Pancadasi by Vidyaranya: "If a man knows the Self as ‘I am this,’ then desiring what and for whose sake will he suffer in the wake of the body?"
Mantra 4.4.12:
आत्मानं चेद्विजानीयादयमस्मीति पूरुषः ।
किमिच्छन्कस्य कामाय शरीरमनुसंज्वरेत् ॥ १२