Verse 3 lays down the condition of entrance into the kingdom, from which necessarily follows the condition of supremacy in it. What a child is naturally, and without effort or merit, by reason of age and position, we must become, if we are to pass the narrow portal which admits into the large room. That 'becoming' is impossible without a revolution in us. 'Be converted' is corrected, in the Revised Version, into 'turn,' and rightly; for there is in the word a distinct reference to the temper of the disciples as displayed by their question. As long as they cherished it they could not even get inside, to say nothing of winning promotion to dignities in the kingdom. Their very question condemned them as incapable of entrance. So there must be a radical change, not unaccompanied, of course, with repentance, but mainly consisting in the substitution of the child's temper for theirs. What is the temper thus enjoined? We are to see here neither the entirely modern and shallow sentimental way of looking at childhood, in which popular writers indulge, nor the doctrine of its innocence. It is not Christ's teaching, either that children are innocent, or that men enter the kingdom by making themselves so. But the child is, by its very position, lowly and modest, and makes no claims, and lives by instinctive confidence, and does not care about honours, and has these qualities which in us are virtues, and is not puffed up by possessing them. That is the ideal which is realised more generally in the child than analogous ideals are in mature manhood. Such simplicity, modesty, humility, must be ours. We must be made small ere we can enter that door. And as is the requirement for entrance, so is it for eminence. The child does not humble himself, but is humble by nature; but we must humble ourselves if we would be great. Christ implies that there are degrees in the kingdom. It has a nobility, but of such a kind that there may be many greatest; for the principle of rank there is lowliness. We rise by sinking. The deeper our consciousness of our own unworthiness and weakness, the more capable are we of receiving the divine gifts, and therefore the more fully shall we receive them. Rivers run in the hollows; the mountain-tops are dry. God works with broken reeds, and the princes in His realm are beggars taken from the dunghill. A lowliness which made itself lowly for the sake of eminence would miss its aim, for it would not be lowliness. The desire to be foremost must be cast out, in order that it may be fulfilled. II. The question has been answered, and our Lord passes to other thoughts rising out of His answer. Verses 5 and 6 set forth antithetically our duties to His little ones. He is not now speaking of the child who served as a living parable to answer the question, but of men who have made themselves like the child, as is plain from the emphatic 'one _such_ child,' and from verse 6 ('which _believe_ on Me').