Self-Love is the Reality of Existence

That what upholds reality is real.
Real is the reality of That.

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What is That? That is Self-Love.
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The deeper meaning of "I am That" is "I am Tat" which is why "Tat Tvam Asi" holds so much significance. Self-Love is known in Sanskrit as आत्मप्रेम (Ātma-Prema) and सच्चिदानन्द (Sat Chit Ananda); this is the state of That/Tát what is you as you are.
~ Wald