Self-Love is the Reality of Existence

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

What is That? That is Self-Love.
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