Tanya Chapter 33 part 2

When we bring the idea of Hashem’s true unity home until it pervades our mind and heart, the joy is enormous! This actually constitutes an experience of the closeness of Hashem. Our realization brings us greater joy than that of the commoner with whom the king shows extra closeness, and in whose home he even comes to dwell. This immense fortune is not something that we worked to acquire, it is an inheritance. It is our secret and our treasure, to directly experience the Divine most deeply and genuinely and to know that there is nothing else besides Him.