In plain words
To lead it into the right path he gives man knowledge. This is the chief work of Hiraṇyagarbha. Hiraṇyagarbha has two more names. As a thread runs through gems, so he has one name, Sūtrātmaka. That is, in the gems that are each human being he takes the form of a thread and runs through all alike. This very thing has been called the thread of Brahman. The principle in which the thread called God joins all men alike and shows equality in all, with no distinction of this one and that one, is the principle of Hiraṇyagarbha. Hiraṇyagarbha has shown the world a creation without distinction. He has made himself known by another name, Sūtrātmaka. And the second name is Prāṇa: Hiraṇyagarbha, Sūtrātmaka, Prāṇa, these are the three names. For him, this Hiraṇyagarbha takes on a subtle shape and is the one who takes the form of the Ātma in the dream state. So Hiraṇyagarbha means the one who is awake in the state of sleep and in the dream state. When Virāṭ has created all in the waking state, Hiraṇyagarbha creates all by saṅkalpa alone. Whatever thing we see, it is a creation of saṅkalpa itself. It has no substance and no ground. Whatever we see in a dream is the creation of Hiraṇyagarbha. So the subtle Hiraṇyagarbha is creating the whole world in the dream state.
Now the third, Avyākṛta. Avyākṛta means the one who has no shapes at all. He is wholly without form in the causal body and goes on experiencing the deep-sleep state. He has no shape at all. He has no shape, yet he holds all things in his hand. He has no limbs such as hands and feet, yet he does all work. He travels many distances. He has no eyes, yet he sees all things. He has no ears, yet he hears everything. So he performs all the karmas that belong to creation, yet he has no shape. This very one has been called Avyākṛta. This Avyākṛta has two more names as well. The second is Antarātma. The third is Īśvaratva. In these three, Virāṭ, Hiraṇyagarbha and Avyākṛta, three names arise again; what is the inner meaning of all these?