J. H. Kurtz, Church History, Volume 1 (of 3…
“ Sabellius and Dionysius of Alex. and Dionysius of Rome.―We have already seen that Sabellius had founded in Rome a speculative Manichæan system, which found much favour among the bishops of his native region. His assigning an essential and necessary place in his system to the Holy Spirit indicates an important advance. God is a unity (μονάς) admitting of no distinctions, resting in Himself as θεὸς σιωπών coming forth out of Himself (for the purpose of creation) as θεὸς λαλῶν. ”
