“…see to it that you hold reason in check and do not follow her beautiful cogitations. Throw dirt in her face and make her ugly.”
Reason, as good, beautiful, and useful as she is, can become, again in Luther’s words, a ‘whore’ which leads astray. Trust God, not self and certainly not the idols created by your own mind. Trusting something your mind invents is the most foolhardy of all the follies. After all, reason isn’t God, God is. Reason isn’t infallible and can only be trusted so far.