(just breaking up my reply)I think we as Christians must train ourselves to be constrained by words. When it comes to the scriptures this will automatically put us into a system of study and will drive us to word studies.
If we were constrained by the words of Scripture then many doctrines and theologies would not exist.
The Doctrine of the Trinity, as is typically defined in Systematic Theologies, would not exist. The Penal Substitution Theory of Atonement would not exist. Neither would the Satisfaction Theory. Calvinism, Arminianism, Methodist Theology, Anabaptist theology, Baptist Theology....none of these would exist.
We cannot be constrained by the words because that is not how human beings think. We put the words together to form ideas. Just that act of reading a line of consecutive words as a sentence often allows in room for interpretation.
But I do agree that we should limit foundational doctrine to the actual text of God's Word. If you can't highlight it in your Bible with a pen then don't build on it.