So there are so many causes. I am caused by my father, my father is caused by his father, his father is caused by his father, you go on, go on. Then you come to the supreme father. He is the cause of all causes. That is Kṛṣṇa. The supreme father is the cause of all subordinate fathers. That is the definition of God, another definition. Īśvaraḥ paramaḥ kṛṣṇaḥ (Bs. 5.1). Īśvaraḥ, īśvaraḥ means controller. So controller, you are also controller. You control over your family, over your son, over your wife. And if you go to the office you become controlled by your boss. So here the controller is relative. Both I am controller and controlled. But when you find somebody else—he is simply controller, not controlled—that is God. This is simple definition of God. You will find everyone relatively controller and controlled. But go on searching out where is that person that He is controller but not controlled. That is īśvaraḥ. That is īśvaraḥ paramaḥ, the supreme īśvara.
And who is that? Kṛṣṇa. When Kṛṣṇa was present He was not controlled by anyone. He was only controller. If you study the life of Kṛṣṇa, you will find He is always controller, never controlled by anyone. Therefore the śāstra says, īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ (Bs. 5.1).