One must realize that "Everything belongs to God; nothing belongs to me. Even this body is given to me by God. "Why a different body? The different body is... God gives us different body according to our karma. That is explained. Karmaṇā daiva-netreṇa jantur dehopapattaye (SB 3.31.1). How we get a different type of body? We have got different types of body. Because according to our past karma, we have created a certain type of body and now we have entered into that body and working according to past karma.
The Christian theologicians, they do not believe in the karma. I was student in Christian college, Scottish Churches College. So in our younger days, the Professor, Dr. W.S. Urquhart. So I heard his lecture, that he did not believe in the karmas. He said that "If I am suffering or enjoying for my last karma, who is the witness? Because some witness must be there that I have done this." But at that time we were not very expert. But this Hṛṣīkeśa is the witness, anumantā upadraṣṭā. Upadraṣṭā. He is simply seeing. So the Christians, they have no Paramātmā idea. Sometimes they say holy ghost. Means a clear idea. But this Hṛṣīkeśa is clear idea. Hṛṣīkeśa. Hṛṣīka-īśa.