In plain words
So a seed always comes joined with this husk. Because it is joined with the husk, we cannot see the seed within. That husk is Prakṛti. Right within it lies the seed called divinity. As long as our sight rests on the husk called Prakṛti, we cannot notice the seed. The truth of this divinity is covered by the truth of Prakṛti. We must make a fitting effort to recognise the truth of such Prakṛti. This is what the Upaniṣads declared: ‘Īśāvāsyam idaṃ sarvaṃ.’ That is, what is there in the whole world is one single seed. So, if we want to understand the truth of the Upaniṣad well, we must try to recognise what is true in our daily life. For what purpose has this Prakṛti come into being? Prakṛti lends its help so that the unseen humanness may be given divinity, be made to recognise its true nature, and fulfil its duty. Mountains become small stones and help man build his house. Trees make pieces of their branches and twigs and serve for building houses, and what is left serves as firewood too, and so they help man. In this way, in the creation of God, who is the embodiment of consciousness, every living being from the ant to the elephant has been doing good to man. Cows have given man their holy milk and brought him strength and contentment. Bullocks help man plough the land, grow the crops and keep helping him. Sheep, goats, hens, fish and the little birds, all of these have become food for man. If we enquire in this way, every being and every thing in creation has been of use to man's life.
Prakṛti itself is our best guru
Not only this; the sun, the moon and the rest also keep rendering service to man.