Ignorance is not a virtue. It is possible to commit serious sin by refusing to accept what can be known by reason.
INVINCIBLE IGNORANCE
Lack of knowledge, either of fact of law, for which a person is not morally responsible. This may be due to the difficulty of the object of the knowledge, or scarcity of evidence, or insufficient time and talent in the person, or any other factor for which he is not culpable.
(Etym. Latin
in, not +
vincibilis, easily overcome:
invincibilis.)
VINCIBLE IGNORANCE
Lack of culpable knowledge for which a person is morally responsible. It is culpable ignorance because it could be cleared up if the person used sufficient diligence.
One is said to be
simply (but culpably)
ignorant if one fails to make enough effort to learn what should be known; guilt then depends on one’s lack of effort to clear up the ignorance.
That person is
crassly ignorant when the lack of knowledge is not directly willed but due to neglect or laziness; as a result the guilt is somewhat lessened, but in grave matters a person would still be gravely responsible.
A person has
affected ignorance when one deliberately fosters it in order to not be inhibited in what one wants to do; such ignorance is gravely wrong when it concerns serious matters.
(Eytm. Latin
vincibilis, easily overcome;
ignorantia, want of knowledge or information.)
Pocket Catholic Dictionary, John A. Hardon, S.J
FrAmbrose:
Did anybody say that it was?
The Orthodox are also ignorant of the infallibility of the bishops of Rome, and ignorant also of the Roman Pontiff’s certainty of his immediate and universal jurisdiction, and ignorant of his claim that nobody can be saved unless they are in communion with him…
Ah, blessed ignorance!