go reason!

For, first, although man's reason or natural intellect indeed has still a dim spark of the knowledge that there is a God, as also of the doctrine of the Law, Rom. 1:19ff, yet it is so ignorant, blind, and perverted that when even the most ingenious and learned men upon earth read or hear the Gospel of the Son of God and the promise of eternal salvation, they cannot from their own powers perceive, apprehend, understand, or believe and regard it as true, but the more diligence and earnestness they employ, wishing to comprehend these spiritual things with their reason, the less they understand or believe, and before they become enlightened and are taught by the Holy Ghost, they regard all this only as foolishness or fictions.
Solid Declaration, FC 1580