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 sufficient in other cases where these suppositions are not verified. In general, where knowledge is of obligation those efforts must be made to acquire it which ordinarily prudent and good men would exert in the circumstances.

Vincible ignorance is such as can be removed by the use of the requisite diligence. Various degrees are distinguished by divines according as some, or little, or no diligence is exercised to dispel it or means are used to foster it. If means are used to foster it, the ignorance is called affected; if little or no diligence is used to dispel it, it is called crass or supine; if some diligence is used, but not what is required in the case, it is called simply vincible ignorance.

(b) With reference to the object of ignorance, we must distinguish ignorance of law, fact, and penalty. There is ignorance of law, if the law's existence is not known, as when a Catholic does not know that the Church forbids marriage within the third degree of kindred. There would be ignorance of fact, if it were not known that A. B. is related to C. D. within the third degree. Ignorance of the penalty is distinguished from ignorance of law when some special sanction is not known, though the law itself is known.

(c) With reference to the action of the subject, we distinguish antecedent, consequent, and concomitant ignorance. Antecedent ignorance is not voluntary, it is not willed by the subject; consequent ignorance is voluntary; concomitant is not expressly willed, but the action which is done with concomitant ignorance would ex hypothesi be done, even if the ignorance did not exist.

3. Invincible ignorance, as defined above, excuses from fault, so that, however bad an action done in invincible ignorance may be, it cannot be a formal sin. The reason is obvious; there is no knowledge in the agent of the malice of the action, and so the bad action is involuntary, and not imputable.

4. Vincible ignorance of the malice of the act, however, cannot excuse one who does wrong. He does not indeed will the evil in itself, but he wills its cause, and so it is voluntary in its cause and imputable. A person who sins in simply vincible ignorance, or even in crass ignorance, is indeed less blameworthy than one who sins with full knowledge of the malice of his act; the sin is only imperfectly voluntary, and less imputable than if perfectly voluntary. There is an apparent difference of opinion among theologians as to whether affected ignorance increases or lessens the malice of a wrong