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
True. Which is not the same as saying that we ourselves have reached a complete and full understanding of Revelation. Such a claim would be presumption and a manifestation of pride.
Rather, our understanding of that Revelation continues to develop. This in fact, is a sign of God's love. Thanks to the assistance of the Holy Spirit, the understanding of both the realities and the words of the heritage of faith is able to grow in the life of the Church. This enables the Church to penetrate the mystery of Revelation ever more deeply.