In my post, Trinity on Trial : A Prologue, I described the Trinity as:
"...a teaching which says, in effect: That there is one God; That this God may take on any of three persons - God the Father, God the Son, and God the Holy Spirit."
Commentors have criticised my description of the Trinity, failing to note, firstly, that I qualified my statement by including the words "in effect" and, secondly, that this blog was not created to argue theological minutiae but to address issues concerning the faith held by the great majority of Christian folk.
It is vitally important for Christians who are not theologians, for persons of other faiths, and for those of no faith at all, to have theological complexity reduced to a simple statement describing only the energising essence behind the 'Trinity' doctrine.
To theologians, the differences between Sabellianism (Modalism, Patripassianism) and Trinitarianism may be vitally important but, to most folk, they mean absolutely nothing. Nor should they - these products of theological nitpickings have nothing to do with the Hebrew God of Scripture.
But for the theologically minded, I'll just add that scholars today disagree as to what, exactly, Sabellius or Tertullian's 'Praxeus' taught.