 Ignorance that contributes to an erroneous conscience that is in any way voluntary is vincible, or able to be corrected, and therefore culpable if followed. This generally happens where the agent’s ignorance of the particulars of the situation is either the result of negligence, or where there is ignorance of the relevant moral principles. The former cases are the result of the agent not taking appropriate care to find out about the facts of situation so that he or she can sin while feigning ignorance. In the case of one’s ignorance of universal premises, this too is culpable since it is one’s obligation to know the moral law. (Summa theologica I-II, q. 19, a. 6, corp.).