There were those who tried to save faith by making room for it alongside the light of reason. Such room would open up wherever the light of reason could not penetrate, wherever certainty was no longer possible. Faith was thus understood either as a leap in the dark, to be taken in the absence of light, driven by blind emotion, or as a subjective light, capable perhaps of warming the heart and bringing personal consolation, but not something which could be proposed to others as an objective and shared light which points the way. Slowly but surely, however, it would become evident that the light of autonomous reason is not enough to illumine the future; ultimately the future remains shadowy and fraught with fear of the unknown.
Francis, Lumen Fidei 3.