The pupil cannot explain the process of a problem until he has worked it out for himself. True, he may repeat by rote the rule, but the proof lies in the work.
Jesus taught his disciples the necessity of obedience to the law of Spirit, for only through this obedient attitude of the human before the Divine can it become the reflector of the spiritual.
To the wilful and froward state of mind this is distasteful, and if not changed by honesty and humility it seeks other means of attaining its ends. The first thing done is to justify self by accusing others falsely.