In plain words
So this whole world is made up of mere names. With the name goes a form; these two, name and form, are both imagined. When we give up these imaginings, the eternal shows itself plainly to us. So this world, made of name and form, is also asti, bhāti, priya. That is, it is made of Sat, Cit and Ānanda. So in this world no world, no object, is found without the Oṃkāra; no object, no thing, without Brahman; no object, no thing, without the Ātma.
So to make a fitting effort to recognise our own principle is sādhana. To recognise one's own existence and live by it is man's chief duty. All that is seen is mithyā. What has taken this as its ground is Satya. In this mithyā too there is Satya. In Satya too mithyā lies merged. But merely to inquire into mithyā in Satya and Satya in mithyā is not our chief duty, our goal. We must recognise Satya from Satya. This is the chief sādhana. For this sādhana we must believe in Divinity everywhere. What dwells, shines and shows itself in every man is one alone: that is the principle of God. So we must make a fitting effort to recognise the unity in the many. So we cannot recognise the Ātma as being in some one particular place. It fills everything. That is, it is the very joining of speech, the mind and prāṇa. The mind is made of food alone. Whatever food we eat, the mind is filled with thoughts of that kind. So the mind is made of food. So when we join this mind made of food in close kinship with that which is made of speech, and through that make it one with what is made of prāṇa, we can see the form of the Ātma. That is, the oneness of the three is this form of the Ātma. GOD: just as, when we join these three letters, we think GOD, in the same way speech + mind + prāṇa = Ātma. All that the world is made of is Matter. So we must not keep this Matter as Matter alone. We must join to it the principle that is eternal and true. What is the world? Matter + Being = Nature; the world does not exist apart. In this world the Ātma is joined with matter, with substances. Without this Sat, we would not see this impermanent Prakṛti. With the substance that changes, the Divinity that does not change is joined.