Dear Diwanji Saheb,
Again, God can only be known in and through man. Vibrations of light are everywhere, even in the darkest corners; but it is only in the lamp that it becomes visible to man. Similarly God, though everywhere, we can only conceive Him as a big man. All ideas of God such as merciful preserver, helper, protector — all these are human ideas, anthropomorphic; and again these must cling to a man, call him a Guru or a Prophet or an Incarnation. Man cannot go beyond his nature, no more than you can jump out of your body. What harm is there in some people worshipping their Guru when that Guru was a hundred times more holy than even your historical prophets all taken together? If there is no harm in worshipping Christ, Krishna, or Buddha, why should there be any in worshipping this man who never did or thought anything unholy, whose intellect only through intuition stands head and shoulders above all the other prophets, because they were all one-sided? It was he that brought first to the world this idea of truth, not in but of every religion, which is gaining ground all over the world, and that without the help of science or philosophy or any other acquirement.
Yours ever faithfully,
Vivekananda.