' When people find and recognize the soul within themselves, they realize that the soul is the Creator of all things, the author of the universe itself. They know that the world belongs to the soul - the world is the soul.
'We can find and recognize the soul even while we are alive on earth. And through finding the soul, we become immortal. But so long as we fail to find the soul, we must endure great suffering.
'When we perceive that the soul is divine - when we acknowledge the soul as the master of what was, what is, and what will be - all fear is dispelled. We rejoice in that perception, since it makes us immortal.
'The soul is the breathing behind breathing, the sight behind sight, the hearing behind hearing, the thinking behind thought.
' The soul has existed from before the beginning of time.
'The who know the soul, realize that all is one. They realize that diversity is an illusion, and unity is truth. Those who see only diversity, and cannot see unity, wander from death to death'.
Brihadaranyaka Upanishad 4:4, 12-15, 17-19