[My father] impressed upon me from the first, that the manner in which the world came into existence was a subject on which nothing was known: that the question, Who made me? cannot be answered, because we have no experience or authentic information from which to answer it; and that any answer only throws the difficulty a step further back, since the question immediately presents itself, Who made God?

Ch. 2: Moral Influences in Early Youth. My Father's Character and Opinions. - Autobiography (1873)