Formerly, and even in recent times, many writers on the Catholic side have endeavoured to prove that the principal motive for Luther’s new opinions lay in worldliness, sensuality, and more especially sins of the flesh. In order to explain his teaching attempts were made to establish the closest connection between Luther’s views with regard to the survival of sin in man without his consent, the covering over of man’s guilt by the merits of Christ and the worthlessness of good works on the one hand, and on the other a nature ravaged by sinful habits, such as was attributed to the originator of these doctrines. The principal argument in favour of this view was found in the not unusual experience that intellectual errors frequently arise from moral faults. When, however, we come to examine Luther’s character more narrowly, we at once perceive that other factors must be taken into consideration in his inward change, so that, in his case, it is not easy to decide how far his new ideas were produced under the pressure of his own sensuality. It was taken for granted that, owing to habitual moral faults, and through constant indulgence in the concupiscence of the flesh, he had been reduced to a state of utter inward degradation. Now, in point of fact, beyond what has been already quoted nothing can be found regarding his moral conduct previous to his change of view. No other circumstances are known concerning Luther than those already mentioned and those to be given later. It is true that history does not possess the all-seeing eye of Him who searches the heart and the reins; the sources containing information concerning the youth of Luther, before and after his profession, are also very inadequate; nevertheless, we must admit that the only arguments upon which the assertion of his great inward corruption could historically be based, namely, actual texts and facts capable of convincing anyone, are not forthcoming in the material at our command.[262] If Luther did actually teach the fatal invincibility of concupiscence (of this we shall have more to say later), yet he might well have arrived at this view by some other way than that of constant falls and the abiding experience of his own weakness and sinfulness. It is at least certain that sad personal experience is not the only thing which gives rise to grave errors of judgment. Nor does the manner in which Luther represents concupiscence prove his own inward corruption. He does not make it to consist merely in the concupiscence of the flesh, and when he says that it is impossible to conquer concupiscence he is not thinking merely of this. When he speaks of concupiscence, and of a “_fomes peccati_” in man, he usually means concupiscence in the wide theological sense, i.e. as the attraction to every transgression which flatters our imperfect and evil nature, in particular to selfishness, as the centre around which clusters all that is sinful—pride, hatred, sensuality, etc.