(b) To be sufficient, diligence should equal that which is employed by good people in similar circumstances. Thus, the unlearned who consult the learned or frequent the instructions provided for them, the learned who devote themselves to study as ordered and who seek assistance in doubts, are sufficiently diligent. 910. One who has not used sufficient diligence is sometimes responsible, sometimes not responsible. (a) A person is not responsible for his ignorance and lack of sufficient diligence, if he conscientiously desires to have the proper amount of instruction, and has not even a suspicion that his studies and knowledge are not sufficient. Example: Titus, having gone through a very small catechism, thought that he understood Christian doctrine sufficiently and had done all that was required. But some years later he discovered, when examined, that he was ignorant of many important matters, and had entirely misunderstood others. (b) A person is responsible for his lack of diligence and knowledge, if at heart he does not care to know, even though no fears or doubts about his ignorance disturb him. Examples: Balbus always felt religion a bore. At Sunday school he was daydreaming; now during sermons on Sunday he falls asleep. The result is that he has many infidel ideas, but doesn’t know it, and is not much concerned. Caius secured for himself an office, for which he is unfitted on account of his ignorance. But he enjoys his position so much, and cares so little about its responsibilities, that he does not even dream of his incompetence, and would not try to change things if he did. 911. Similar to negligence about the truths of faith itself is negligence about truths connected with faith. (a) An unbeliever is guilty of negligence when against conscience he fails to pray for light and to inquire or inform himself about the credentials of religion, revelation, and the Church; (b) a believer is guilty of negligence if he fails to seek answers to objections against faith, when thrown much in the company of objectors.