There is only God.
God is One without a second.
Hence “Tat Tvam Asi”.
Or as it is said in the Rig Veda; “Truth is One”.
So eventually it is realized that there is only Oneself (or One Self).
Oneself equates to Ahaṁ Brahmāsmi (अहम् ब्रह्मास्मि).
The correct translation is not “I am the Absolute" but “I is the Absolute” for there is only one Ego, one Self which is all-inclusive.
Thus it is realized that the illusion of separation (Māyā/माया) exists NOT first and foremost out of Lila (Playfulness/लीला) but to have someone to be with, not to be alOne, to have companionship.
Companionship equates to Love, Warmth, Togetherness.
Love is therefore the greatest commandment for there where we see others is only Oneself.
There is no division.
There is only diversity.
Indeed; the cause of all this diversity is loneliness (Brihadaranyaka Upanishad) while the purpose is companionship, i.e., not to be alone; so yes, Love indeed. Synopsis:
The origin of life is oneself.
The cause of life is loneliness.
The purpose of life is Love.
Very simple.
Very true.
See all as self for it is.
Feel only Love.
Love is the first law.
It is the law of oneself.
~ Wald