Realized Sages such as Bhagavan Sri Ramana have indicated the experience or the state of the Self.  It is what it is.

It is the Heart of Existence, and Existence It Self.  Sri Ramana used to say that It is only Being.

You can call it what you like. Self, No-Self, Shunya, Reality. What difference can it make? The ultimate Reality cannot be named. It has no name. There is no one outside of Reality to give it a name.

Ancient sages taught that the core of our being is pure Sat-Chit-Ananda which roughly translates from Sanskrit as Existence, Knowledge/Consciousness, Bliss as One.

It is devoid of thought or doubt or conflict, but utterly complete and supreme over its domain, its domain being no other than It Self.

It is the Eternal Reality which is not conscious of anything separate from it, being Pure Consciousness Itself.

It is beyond happiness…