Duality is an illusion. And since we are under the illusion of duality, everything from that point is untrue. Every joy you've ever had, though it perhaps has been pleasurable, never let you saw the truth of your existence - non-duality, or unity. At the first desire, there is incompleteness, imperfection; a perfect being has no incompleteness, or desire. But realization of non-duality is completely inconceivable without direct experience of non-duality. But experience of non-duality cannot be understood by language or concepts.
It is inexpressible but not speculation, it is an experience. That non-duality goes beyond anything previous to it. No matter a king or a beggar, all is illusion based on duality. So if you realize you are one with the universe, with the cosmos, you realize you are far greater than any role you could pretend to be.
Realization of non-duality and simultaneous freedom of desire - in other words, acceptance of the present, the circumstances, non-attachment to happiness or distress - this bears the fruit of complete peace.