[marshmallow]

You are correct in stating that Revelation ceased with the death of the last Apostle. Yet even if Revelation is already complete, it has not been made completely explicit; it remains for Christian faith gradually to grasp its full significance over the course of the centuries. This is precisely what has happened with the Immaculate Conception and Assumption, for instance.

Lest you think that this is something novel, consider the dogma of the Holy Trinity. During the first centuries the Church sought to clarify her Trinitarian faith, both to deepen her own understanding of the faith and to defend it against the errors that were deforming it. This clarification was the work of the early councils, aided by the theological work of the Church Fathers and sustained by the Christian people's sense of the faith.

The Church is a living organism and this process did not cease with the Council of Ephesus or Nicea. It continues today.

[Dr. Eckleburg]

Yet even if Revelation is already complete, it has not been made completely explicit

It is as explicit as God wants it to be.

The doctrine of the Trinity was espoused from the early church, certainly from the fifth century on according to the Nicene Creed.

Most importantly, the doctrine of the Trinity is founded on Scripture.

Unlike the Assumption of Mary which is nowhere in Scripture and remains strictly errant speculation.

In fact, Scripture speaks against anyone deserving of our prayers but God. There is only one rock higher than you and I -- Jesus Christ.

"From the end of the earth will I cry unto thee, when my heart is overwhelmed: lead me to the rock that is higher than I." -- Psalm 61:2

[pjr12345]

it remains for Christian faith gradually to grasp its full significance over the course of the centuries

READ: error creeps in over time.