In plain words
Thinking, 'Today I am going to receive a great teaching from my son Rāmacandra,' she went to the bank of the river Sarayū and bathed with her friends. She looked all around. To see what was there. Everywhere there were sheep. She saw them. Wherever she looked, those sheep were crying, 'Mē, mē!' Poor soul, she came back. 'Mother! Have you bathed?' I have. 'Then what is going on at the bank of the river Sarayū? What animals are there? What people are there? Tell Me,' He said. 'My son! Sheep and goats are grazing the green grass,' she said. 'How are they crying?' He asked. 'It is their nature, is it not? They are crying, "Mē, mē,"' she said. 'What does mē mean?' He asked. It is 'Who am I?' The sheep are recognising, 'Who am I? Who am I?' 'If, being a human being, you do not recognise who you are, you too are equal to the sheep.' He said. So today, if instead of asking yourself 'Who am I?' you ask 'Who are you? Who is he?', you are all the more equal to the sheep. First of all, ask yourself 'Who am I?' In whatever way you were born, you must not die in that same way when you die. When you were born, you cried, 'Koham, koham.' Koham means 'Who am I?' If you die still saying 'Who am I? Who am I?' to the end, what use was there in being born? When you were born, you were born saying 'Koham.' When you die, you must die saying 'Soham.' This alone is worthwhile. So if we are to root out the principle of Ahaṅkāra in us, we must follow one path. Except on the one path of God, it bears no fruit on any other path.
When Ahaṅkāra arises, sit down in a place. Examine your own breath. Observe what your in-breath and out-breath are saying. 'So... ham': follow this breath well. Soham means saḥ and aham: these two words joined and became Soham. Saḥ, you; aham, I. Saḥ, Brahma; aham, I. If we raise in us the feeling 'Ahaṃ brahmāsmi' and go on developing this feeling 'Ahaṃ brahmāsmi', this aham will not trouble us at all. In the language of Vedānta this has been called the Haṃsa Gāyatrī.
Students! In us the inner voice, that is, the conscience, keeps teaching moment after moment through the principle of Soham.