One (1) is a mysterious number.The self is illusory. The self conscious feelings are an illusion. The universe is one. The entity that is you is a fragment of this universe, whether it realizes it or not.
"He is all-encircling, resplendent, bodiless, spotless, without sinews, pure, untouched by sin, all-seeing, all-knowing, transcendent, self-existent; He has disposed all things duly for eternal years.-"Isha Upanishad
Deep down the soul is pure
"It is within because It is the innermost Soul of all creatures; and It is without as the essence of the whole external universe, infilling it like the all-pervading either."-Isha Upanishad
The universe is within you as it is without you as your surroundings.
*Hinduism is a beautiful religion, with brilliant beliefs, but I cant say I practice it.*