Christ's parable about the Kingdom of Heaven in the world being like a man that sowed good seed in his field, which sprung up intermingled with tares, contains the lesson, not so much of the purity or nonpurity of the Church as of the inseparable intertwining in the world of Christian people with others. The roots are matted together, and you cannot pull up a tare without danger of pulling up a wheat-stalk that has got interlaced with it. That is but to say that Society at present, and the earthly form of the Kingdom of God, are not organised on the basis of religious affinity, but upon a great many other things, such as family, kindred, business, a thousand ties of all sorts which mat men together, and make it undesirable, impossible, contrary to God's intention, that the good people should club themselves together, and leave the bad ones to rot and stink. The two are meant to be in close contact. 'Let both grow together till the harvest.' If any Christian man were to do as the monks of old did, fly into solitude to look after his own soul, then the question which came to Elijah would be suitable to him, 'What doest thou here?' Is there not work enough for you out there, in that wicked world? Is that not the place for you? Where is the place for the 'salt'? Where the meat is in danger of putrefaction. Rub it in! That is what it was meant for. 'Ye are the light of the world.' That suggests the picture of a lamp upon a pedestal that it may send out its rays, but itself remains apart. But the companion metaphor suggests the closest possible contact, and such contact is duty for us Christian people. Elijah ran away from his work. There are types of Christian life to-day unwholesomely self-engrossed, and too much occupied with their own spiritual condition, to realise and discharge the duty of witnessing in the world. Wherever you find a Christian man--whether he is a monk with bare foot, and a rope round his brown robe, and shaven head, or whether he is in the garb of modern Protestantism--that tries more to keep himself apart, in the enjoyment and cultivation of his own religious life, than to fling himself into the midst of the world's worst evil, in order to fight and to cure it, you get a man who is sharing in Elijah's transgression, and needs Elijah's rebuke. The intermingling is inevitable in the present state of things; and family, kindred, business, social and political movements, all require that Christian people should work side by side with men who are not possessors of 'like precious faith.' If ever there have been individuals or communities that have tried to traverse that law, they have developed narrowness and bitterness and stunted growth, and a hundred evils that we all know. II. And now let me say a word about the second thing, and that is--the imperative separation.