New Catholic Encyclopedia, 1967, Vol. XIV, p.295:
"When one does speak of unqualified Trinitarianism, one has moved from the period of Christian origins to, say the last quadrant of the 4th century ... Herein lies the difficulty. On the one hand, it was the dogmatic formula "one God in Three Persons" that would henceforth for more than 15 centuries structure and guide the Trinitarian essence of the Christian message ... On the other hand, the formula itself does not reflect the immediate consciousness of the period of origins; it was the product of 3 centuries of doctrinal development."
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