Who is God? That He is the most perfect eternal, He is the most perfect living force. That is God.
Eko bahūnāṁ vidadhāti kāmān. Eko bahūnāṁ vidadhāti kāmān (Kaṭha Upaniṣad 2.2.13). The meaning is that one living force is supplying all the demands of all other living entities. Just like in a family the father is supplying the necessities of the wife, the children, the servant, a small family.
Similarly, you expand it—the government or the state or the king is supplying the necessities of all the citizens. But everything is incomplete. Everything is incomplete. You can supply your family, you can supply your society, you can supply your country, but you cannot supply everyone.
But there are millions and trillions of living entities. Who is supplying food? Who is supplying hundreds and thousands of ants within the hole in your room? Who is supplying food? When you go to the green lake there are thousands of ducks. Who is taking care of them? But they are living. There are millions of sparrows, birds, beasts, elephants.
At one time he eats hundred pounds. Who is supplying food? Not only here, but there are many millions and trillions of planets and universes everywhere. That is God. Nityo nityānām eko bahūnāṁ vidadhāti kāmān. Everyone is dependent on Him, and He is supplying all the necessities. All the necessities. Everything complete. Just like this planet, everything is complete.