Now the former of these two, the knowledge which is merely the work of the understanding, is, of course, independent of love. A man may know all about Christ and His love without one spark of love in his heart. And there are thousands of people who, as far as the mere intellectual understanding is concerned, know as much about Jesus Christ and His love as the saint who is closest to the Throne, and yet have not one trace of love to Christ in them. That is the kind of people that a widely diffused Christianity and a habit of hearing sermons produce. There are plenty of them, and some of us among them, who, as far as their heads are concerned, know quite as much of Jesus Christ and His love as any of us do, and could talk about it and argue about it, and draw inferences from it, and have the whole system of evangelical Christianity at their fingers' ends. Ay! It is at their fingers' _ends_, it never gets any nearer them than that. There is a knowledge with which love has nothing to do, and it is a knowledge that for many people is quite sufficient. 'Knowledge puffeth up,' says the Apostle; into an unwholesome bubble of self-complacency that will one day be pricked and disappear, but 'love buildeth up'--a steadfast, slowly-rising, solid fabric. There be two kinds of knowledge: the mere rattle of notions in a man's brain, like the seeds of a withered poppy-head; very many, very dry, very hard; that will make a noise when you shake them. And there is another kind of knowledge which goes deep down into the heart, and is the only knowledge worth calling by the name; and that knowledge is the child, as my text has it, of love.