We can understand, then, why the New Catholic Encyclopedia observes: “There are few teachers of Trinitarian theology in Roman Catholic seminaries who have not been badgered at one time or another by the question, ‘But how does one preach the Trinity?’ And if the question is symptomatic of confusion on the part of the students, perhaps it is no less symptomatic of similar confusion on the part of their professors.”

And a Catholic authority says that the Trinity “is not . . . directly and immediately [the] word of God.”—New Catholic Encyclopedia.

“The formulation ‘one God in three Persons’ was not solidly established, certainly not fully assimilated into Christian life and its profession of faith, prior to the end of the 4th century. . . . Among the Apostolic Fathers, there had been nothing even remotely approaching such a mentality or perspective.”—New Catholic Encyclopedia.

And the New Catholic Encyclopedia also says: “The doctrine of the Holy Trinity is not taught in the O[ld] T[estament].”