"The word Trinity is not found in the Bible, and though used by Tertulian in the last decade of the 2nd century, it did not find a place formerly in the theology of the church till the 4th century. It is however the distinctive and all-comprehensive doctrine of the Christian faith.
Though it is not a Biblical doctrine in the sense that any formulation of it can be found in the Bible, it can be seen to underlie the revelation of God...
The necessity to formulate the doctrine was thrust upon the church by forces from without, and it was, in particular, its faith in the deity of Christ, and the necessity to defend it, that first compelled the church to face the duty of formulating a full doctrine of the Trinity for its rule of faith." Divine Truth or Human Tradition. Patrick Navas
In the above book, other scholars query the statement, saying "... if the true faith held by Christians is communicated accurately and sufficiently in the 'God-breathed' Scriptures (which exist so that the man of God may be 'adequate' and 'fully equipped for every good work'. 2 Timothy 3:17.18) how could it be said at the same time, that it was 'necessary' for the 'church fathers' or 'church councils' to 'develop' or 'formulate' a doctrine as significant and as allegedly central as the Trinity, the very definition of who God is?
Is there any evidence that the formation of these councils were authorized by God or by Christ?
And should Christians, with respect to the essentials of the faith, regard the decisions of the councils as binding and conclusive?' Ibid.
Good question.
Do you remember what Martin Luther said about church councils in his monumental speech before the Diet of Worms?
He said, 'Unless I am convinced by the testimony of the Scriptures or by clear reason (for I do not trust either in the pope or in councils alone, since it is well known that they have often erred and contradicted themselves), I am bound by the Scriptures I have quoted and my conscience is captive to the Word of God. I cannot and will not recant anything, since it is neither safe nor right to go against conscience. May God help me. Amen." Brackets in quote. D'Aubigne's History of the Reformation
Shouldn't we also stand by the Word of God?
"Where Scripture is silent, it is unwise to make definitive pronounce-ments." Wayne A Grudem