In plain words
As long as this sense of duality is in you, Advaita will not come to you. A man with dual mind is half-blind. You think the other person is a stranger. You think the one in your house is your own. This is a great mistake. All are your own forms. We must experience such oneness. “The vision of Advaita is Jñāna,” it has been said. “I myself am in all. All are in me”: cultivate this feeling! That true form too is in this very body. The Ātma that is in all bodies is in you too.
Forget attachment to the body and foster attachment to the Ātma
Embodiments of Prema! The very Ātma that is in you is in others too. Even while experiencing the divinity that is the inner Ātma of all beings, man deludes himself that he is experiencing something foreign. This is a notion born of ignorance. Once a dog was going about looking for food. It came upon a dried-up bone. It gnawed at it hard, eagerly. Then a piece of the bone broke off and lodged in its teeth. At once blood came. Tasting that blood, the dog enjoyed it. “This blood is coming from the bone I bit,” it imagined. In fact it was its own blood. In the same way, man today also forgets the joy within him, believes that this joy comes from outside, and tries merely to enjoy joy. This is a great mistake. Each thing comes from oneself alone. Sorrow or joy, it is nothing but your delusion. The pleasure is an intervel between two pains. Only between two sorrows does a joy come. So joy and sorrow, both are in us; they do not come from outside. This is how we must enquire. Vedānta said this very thing when it told you to seek yourself. A small example: once an I.A.S. officer, camping in a taluk, came to stay in a house. Everyone kept frightening him that there were ghosts in that house.