In plain words
We must develop Prema for God. Merely developing Prema for God is not enough. We must draw near to the Prema of Brahman. Merely drawing near is not enough. We must rest upon the full and supreme principle. Only then can humanness turn into divinity. In the Taittirīya Upaniṣad the teachers taught their students this Śikṣāvallī, and its authority and its essence they have set forth for the attaining of this Brahmānanda.
Brahmavidyā is not merely a learning beyond the human. It is the natural sādhanas that nourish a personality which walks the path of Satya in daily life. Man must increase this wealth of sādhana day by day. The Upaniṣad has set out three forms of this Brahman principle. These three forms, called Virāṭ, Hiraṇyagarbha and Avyākṛta, belong to gross, subtle and causal. They belong to waking, dream and deep sleep. Virāṭ means the Ātma principle that lives long in the physical body, takes on a gross form, and is the very embodiment of the waking state; this is the form of Virāṭ. This Ātma principle, the embodiment of the waking state, is the one named the Virāṭ form. He takes on names and forms and shows himself under many names. That is, he has been called the Virāṭ form because he shows the whole world of the moving and the unmoving as his own form, shows the five elements beginning with space as his forms, shows everything from the ant up to Brahmā as his forms, and so comes to the state where all is the form of Viṣṇu. That is, hills and mounds, rivers, mountains, the sea, the whole world that is shaped of all we see, is the form of Virāṭ itself. Whatever is seen, with no distinction of this and that, all of it is a part of the one whose form is Virāṭ. So Virāṭ is the one who, in relation to the outer world, takes on the gross form of the world and gives this world its ideal.
He has two more names. The second is Vaiśvānara. Vaiśvānara is the one shown in every person by the word "I, I". From king to farmer, from beggar to rich man, from child to old man, from woman to man, every person who introduces himself uses the word "I, I".