"The Reformation was a time when men went blind, staggering d..." — Robert Farrar Capon quote meaning

The Reformation was a time when men went blind, staggering drunk because they had discovered, in the dusty basement of late medievalism, a whole cellar full of fifteen-hundred-year-old, two-hundred proof Grace–bottle after bottle of pure distilate of Scripture, one sip of which would convince anyone that God saves us single-handedly. The word of the Gospel–after all those centuries of trying to lift yourself into heaven by worrying about the perfection of your bootstraps–suddenly turned out to be a flat announcement that the saved were home before they started…Grace has to be drunk straight: no water, no ice, and certainly no ginger ale; neither goodness, nor badness, not the flowers that bloom in the spring of super spirituality could be allowed to enter into the case.