It is increasingly popular to forget that it was not man who chose to speak of God as Father. God created and defined the ordering of human relations and used them to reveal something of Himself to us. This is why we mustn’t refer to God in the feminine, though the First Person of the Trinity has no gender. God not only gives revelation, but He has defined the context and signs by which He reveals Himself. It seems to me that the specific Trinitarian formula for Baptism is a recognition then of our role as recipients of divine revelation; it is a humble recognition of our relation to God.