"The Holy Spirit cannot be an agent of truth not expressly warranted by Christ or a Christian apprehension of the sense of prophetic teaching in the Old Testament. This is what we see as crucial to an account of the work of the Holy Spirit in Acts and John. It is to her credit that the Presiding Bishop has sought publicly to defend her novel view and so explain how the Holy Spirit can be showing the way within TEC on matters of sexual relationships and yet speaking in precisely the opposite way to the majority of Christians in time and space. The argument must be made as the warrants for such a novel view must be found if the church’s teaching is to be overthrown."
His whole essay is here.