In all such cases we naturally wonder what can be the cause. And very often our explanation is wide of the mark. In religious enterprises, we are apt to fall back on the sovereignty and inscrutability of God. "He moves in a mysterious way, His wonders to perform." It seems good to Him, for unknown purposes of His own, to subject us to disappointment and trial. We do not impugn either His wisdom or His goodness; all is for the best. But, for the most part, we fail to detect the real reason. That the fault should lie with ourselves is the last thing we think of. We search for it in every direction rather than at home. We are ingenious in devising far-off theories and explanations, while the real offender is close at hand--"_Israel hath sinned_." It was an unexpected obstacle of this kind that Joshua now encountered in his next step towards possessing the land. Let us endeavour to understand his position and his plan. Jericho lay in the valley of the Jordan, and its destruction secured nothing for Joshua save the possession of that low-lying valley. From the west side of the valley rose a high mountain wall, which had to be ascended in order to reach the plateau of Western Palestine. Various ravines or passes ran down from the plateau into the valley; at the top of one of these, a little to the north of Jericho, was Bethel, and farther down the pass, nearer the plain, the town or village of Ai. No remains of Ai are now visible, nor is there any tradition of the name, so that its exact position cannot be ascertained. It was an insignificant place, but necessary to be taken, in order to give Joshua command of the pass, and enable him to reach the plateau above. The plan of Joshua seems to have been to gain command of the plateau about this point, and thereby, as it were, cut the country in two, so that he might be able to deal in succession with its southern and its northern sections. If once he could establish himself in the very centre of the country, keeping his communications open with the Jordan valley, he would be able to deal with his opponents in detail, and thus prevent those in the one section from coming to the assistance of the other. Neither Ai nor Bethel seemed likely to give him trouble; they were but insignificant places, and a very small force would be sufficient to deal with them.