Here's a start. The rigorists  assume a concept of truth which is positivistic: truth is merely stuff: that which is. They consider truth to be something essentially dead: dead, grim reality.  This option also corresponds to a rejection  apriori of every philosophical or metaphysical thought which is squeezed out, outlawed a priori. This conception is at the same time profoundly anti-Christian. The Christian finds his truth in the Word. The rigorist holds that the Word is not the final truth, that behind it there is grim reality, death. Their philosophy is in final analysis pagan. This ideology about being and truth accounts for their thinking regarding conscience. Conscience becomes a function of dead truth.