In plain words
This very thing the scientists of today all called matter and energy. Energy means śakti. In every substance there is the energy that belongs to it. So there is no matter without energy. In just the same way, there is no place without the Ātma, no form without the Ātma, no substance without the Ātma, in all the world. So only when we recognise this Ātma-principle of infinite nature does everything become clear to us.
All is one. It is not that you are separate and I am separate. Bodies may be separate. Names may be separate. But the divine power that dwells in them is one. Here is a big light. But there a light is shining in the Oṃkāra. Here little bulbs are all burning. There big tube lights are burning. That tube's form and that tube's name are distinct. This lamp's form and name are different. That lamp has a different form and name. But in all of them the current is one. In the same way, men's shapes and forms may be distinct. They may be different, each from each. But in all, the Ātma-principle called Divinity is one and the same. Inside the bulbs the colours may be distinct. The voltage may be distinct. For this much alone we must not keep up differences. The principle of power within is one. That is the Ātma; that is Brahman. That is the Praṇava. It is not that Brahman is separate and the Ātma separate.
Another example of this. In the rising sun there are three colours. Red, white, black. Before it rises it is black; then we call it darkness. Gradually, at the time of rising, it turns a little red. But when it shines fully it takes on a white form. In the same way the Ātma, when it is at one level, takes on one form and another. Just as it takes one form in jāgrat, another in svapna and another in suṣupti; just as the sun's colours change before it rises, as it rises and when it shines in full, and the sun remains one; in the same way, though the Ātma is one, the forms of this Ātma change distinctly at different levels, in different times, in different states. To understand it easily: when born, a little one, a child. By ten years we call him a boy.