In plain words
So you must turn self-interest into the interest of others. You must give up attachment to the body and grow in regard for the Ātma.
One who has no faith in the Ātma may well be called blind
You must recognise the truth, “What is in you and in me is the one Ātma.” Look, there are many bulbs to be seen over there. Though their forms and names differ, the current flowing in them is one, is it not! In the same way, though the bulbs called bodies are different, the ‘current’ called the principle of the Ātma flowing in them is one. With this sense of one Ātma, set about relieving the sufferings of those around you. Help others as far as you can. “To help others is merit; to hurt others is sin.” This is the essence of the eighteen Purāṇas that Vyāsa told.
Always do others only good. Do no harm to anyone. There is no sādhana greater than this. This is the very path to the realisation of the Ātma. “Ekam evādvitīyaṃ brahma”: the Ātma is one; there are not two. You take oneness to be manyness. But there is no manyness at all. All is oneness. There is nothing but the Ātma in this world. Why man does not believe in this oneness is past understanding. Man today believes in the radio, the TV and the cinema, but does not believe in the Ātma. One who has no faith in the Ātma may well be called blind. Some people do sādhanas such as japa, dhyāna and yoga. You may do these. They are indeed sacred actions. But above all you must recognise the principle of the one Ātma that is in everyone. God is one. He dwells within all; wherever you look, He is there. Why do you not believe in such divinity?
Through the influence of this Kali age and the influence of the studies you pursue, you trust friends who teach you bad things, but you do not trust those who teach you good and set you on the good path. What sort of studies are these? All you get from them is mere book knowledge. There is one book you must read. That book is this world.