The nucleus for a theistic-Christist creed, as we have seen, was given to the Church in the fourth gospel. The first Jewish Jesuists were simple Unitarians; and the Jesus of Paul, so far as can be safely inferred from epistles indefinitely interpolated, was certainly no part of a trinity in unity. At the beginning of the second century the "orthodox" Christists had no more definite theology than had the unlettered believers in any pagan Saviour-God; and at most the gospels taught them to regard the supernaturally-born Christ as having ascended to heaven, to sit in visible form at the right hand of the Father, as Herakles or Dionysos or Apollo might sit by his Father Zeus. At the middle of the century Justin Martyr speaks of the Logos not as a personal form of deity, but as the inspiration given by God to men in different degrees at different times. It is after him that the fourth gospel begins to do its work. Christian apologists, deriding the beliefs of the pagans, had to meet the charge that they too were polytheists, and the old pagan challenge, put to pagans: If the suffering Saviour were a man, why worship him? if he were a God, why weep for his sufferings?
An attempt to meet the difficulty was made in the heresy of Praxeas, a member of the Church who, coming from Asia to Rome late in the century, seems to have taught that the Son and the Holy Spirit were not distinct from the Father, but simply functions of the One God, the Father having descended into the Virgin and been born as Jesus Christ. At once he was accused of "making the Father suffer" on the cross, and his sect accordingly seem to have been among the first called Patripassians. In the same or the next century Noëtus of Smyrna is found preaching the same doctrine; and in the hands of Sabellius of Libya, whose name was given to it by his opponents, the teaching became one of the most influential heresies of the age. Sabellius in fact formulated that theory of the Trinity which alone gives it formal plausibility: the three personæ were for him (as they could etymologically be in Latin and in the Greek term first used, prosopon) not persons, but aspects or modes of the deity, as power, wisdom, and goodness; or law, mercy, and guidance--a kind of solution which in later times has captivated many theologians, including Servetus and Coleridge. But Sabellius, like his predecessors, had to meet the epithet of "Patripassian," and he appears to have parried it with the formula that only a certain energy proceeding from the Divine Nature had been united to the man Jesus. In the way of rationalizing the irrational and giving consistency to contradictories, the Church could never do better than this. Under such a theorem, however, the Man-God as such theoretically disappeared; and as that was precisely the side of the creed which identified the cult, gave it popularity, and won it revenue, Sabellianism, though accepted by many, even by many bishops, could not become the official doctrine. It persistently remained, nevertheless, in the background, the idea taking new forms and names in succeeding generations, as new men arose with courage and energy enough to reopen the insoluble strife, during a period of four hundred years.