But there is another point here, and that is the contact that is necessary between the leaven and the dough. We have passed from the old monastic idea of Religion being seclusion from life. But that mistake dies hard, and there are many very Evangelical and very Protestant--and in their own notions superlatively good--people, who hold a modern analogue of the old monastic idea; and who think that Christian men and women should be very tepidly interested in anything except what they call the preaching of the Gospel, and the saving of men's souls. Now nobody that knows me, and the trend of my preaching, will charge me with undervaluing either of these things, but these do not exhaust the function of the Church in the world, nor the duty of the Church to society. We have to learn from the metaphor in the parable. The dough is not kept on one shelf and the leaven on another; the bit of leaven is plunged into the heart of the mass, and then the woman kneads the whole up in her pan, and so the influence is spread. We Christians are not doing our duty, nor are we using our capacities, unless we fling ourselves frankly and energetically into all the currents of the national life, commercial, political, municipal, intellectual, and make our influence felt in them all. The 'salt of the earth' is to be rubbed into the meat in order to keep it from putrefaction; the leaven is to be kneaded up into the dough in order to raise it. Christian people are to remember that they are here, not for the purpose of isolating themselves, but in order that they may touch life at all points, and at all points bring into contact with earthly life the better life and the principles of Christian morality. But in this contact with all phases of life and forms of activity, Christian men are to be sure that they take the leaven with them. There are professing Christians that say: 'Oh! I am not strait-laced and pharisaical. I do not keep myself apart from any movements of humanity. I count nothing that belongs to men alien to a Christian.' All right! but when you go into these movements, when you go into Parliament, when you become a city Councillor, when you mingle with other men in commerce, when you meet other students in the walks of intellect, do you take your Christianity there, or do you leave it behind? The two things are equally necessary, that Christians should be in all these various spheres of activity, and that they should be there, distinctly, manifestly, and, when need be, avowedly, as Christian men. Further, there is another thought here, on which I just say one word, and that is the effect of the leaven on the dough. It is to assimilate, to set up a ferment. And that is what Christianity did when it came into the world, and 'Cast the kingdoms old Into another mould.'