LATERAN COUNCIL IV 1215
Ecumenical XII (against the Albigensians, Joachim, Waldensians etc.)
The Trinity, Sacraments, Canonical Mission, etc.*
Chap. 41. The Continuation of Good Faith in Every Precept *
439 Since “everything . . . which is not from faith is a sin” [ Rom. 14:23 ], by synodal judgment we define that no precept either canonical or civil without good faith has any value, since that which cannot be observed without mortal sin must in general be rejected by every constitution and custom. Therefore, it is necessary that he who lay down a rule at no time be conscious of anything wrong.