The word “Trinity” is not found in the bible. The theological concept is there (c.f. Mt. 28), but the doctrinal definitions of the relationship among the 3 persons of the Most Holy Trinity were not dogmatically defined in such a way to express and defend this orthodox doctrine from non-Trinitarian heresies until the Council of Nicea (325 AD) and the three other great early Councils (Constantinopile 381 AD; Ephesus 431 AD; and Chalcedon 451 AD, where Pope St. Leo the Great provided the most concise Christilogical definition with respect to the Divine and Human natures our Lord Jesus Christ.)
So strictly speaking, the word “Trinity” and the “Doctrinal Definition of the Trinity” are not “explicitly” stated in the Sacred Scripture. The Trinitarian Doctrine is implicit in the Biblical text, but it would take the reflections of the early Church Fathers and the great Councils to more fully develop and define this beautiful Doctrine of orthodox Christian belief.
Regards
I agree, though the concept is implied at least, and can be proven with very little extrapolation.
It is an important subject for us both, as it does demonstrate a reasonable conceptual foundation in the Word, something the Protestants are agreeable toward, and use a good bit of Catholic tradition to expand upon.
This sort of 'Foundation in the Word' is the proof that Protestants look for, and stands against those who would accuse us of denying tradition in it's totality. It also stands against those who would say that Protestant 'sola scriptura' is unreasoning.