Three Persons who are One is substance as well?
pony
I was going to stick to the Scriptures and not get off into other things.
But since you ask, I have described the homoousious, "same substance", clause in the Nicene Creed of 325 AD as a big lurch away from the Bible in one direction in order to keep the Arians from making a big lurch away from the Bible in another direction. The idea was to make such a bold statement as to leave the Arians no leg to stand on, but the resulting theological conundrums have reverberated to this day.
If Peter or Paul had been there to preside over the Council, the issue would not have been handled in such a way. Indeed, the Council would not have been called in the first place. Another epistle of Peter or Paul, to be included in the canon of Scripture, would have been the proper way to resolve the issue. That epistle may well have included the following, given by a true apostle of Jesus Christ in modern times (and bringing us back to the Scriptures):
D&C 130:22 The Father has a body of flesh and bones as tangible as man’s; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us.Compare Luke 24:39, Acts 7:55-56, etc.