Semper

Sorry about the format of this message. I left word wrap on and did not get a chance to fix it until the editting time limit had expired.

I would imagine most Protestant theologians who believe in the Trinity believe that the concept is in scripture.

As for the canon being closed, what is the canon? It is a collection of writings from early apostles and their very close associates that depicts apostolic doctrine, the faith once for all delivered to the saints. Good writings of other men in modern times, even prophetic writings cannot meet these criteria.

Do you believe in 'sola scriptura'?