Unity in diversity possible when one becomes aware of the fact that the whole diversity is created out of single stuff. The diversity has no place in reality.
Those who think they are born in a world and world exited prior to them feel the separateness. But when they realize the Self is not the body but the soul/spirit the separateness will fall away.
The birth, life and death are happenings within the illusion, which appears and disappears as waking and dream. The formless substance and witness of the illusion is the soul/true self, is real and eternal.
Judging the truth on the base of birth entity causes the innocence of the reality. The world is within the mind and mind is not within the body. Until one thinks the mind is within the body he will be in the grip of duality. The love and compassion is tools within the duality, but they are not the means to self-knowledge. This is my conviction derived from deeper inquiry and reasoning.