One of the things that leads some to argue that Galileo was the founder of the modern scientific method was his insistence that reason must be always compared to observation. Reason, by itself was not the final arbiter of a dispute.
It was his insistence on this point that was the core of his break from the teleological thinking of Aristotle.
It was also the core of the objection that the Catholic Church had to his writing. (Or so some have argued…)
I wonder if we might gain by making a similar requirement for theological thought. Theological reasoning must always be compared to observation…
In a real sense Holy Scripture contains the observation of God’s action in the world. So using scripture as a theological norm would fit.
But what about things not covered in scripture? Should we be reasoning from principles found in scripture without comparing our deductions to observation?
Full blown calvinism would seem to me to argue that such an idea would necessarily lead to error. But what about folks who don’t believe in the total depravity of creation?