(2) Observe now the assumption on which the demand not to be unequally yoked with unbelievers is based. It is that there are _two_ ethical or spiritual interests in the world, and that these are fundamentally inconsistent with each other. This implies that in choosing the one, the other has to be rejected. But it implies more: it implies that at bottom there are only two kinds of people in the world--those who identify themselves with the one of these interests, and those who identify themselves with the other.
Now, as long as this is kept in an abstract form people do not quarrel with it. They have no objection to admit that good and evil are the only spiritual forces in the world, and that they are mutually exclusive. But many will not admit that there are only two kinds of persons in the world, answering to these two forces. They would rather say there is only _one_ kind of persons, in whom these forces are with infinite varieties and modifications combined. This seems more tolerant, more humane, more capable of explaining the amazing mixtures and inconsistencies we see in human lives. But it is not more true. It is a more penetrating insight which judges that every man--despite his range of neutrality--would in the last resort choose his side; would, in short, in a crisis of the proper kind, prove finally that he was not good _and_ bad, but good _or_ bad. We cannot pretend to judge others, but sometimes men judge themselves, and always God can judge. And there is an instinct in those who are perfecting holiness in the fear of God which tells them, without in the least making them Pharisaical, not only what things, but what persons--not only what ideas and practices, but what individual characters--are not to be made friends of. It is no pride, or scorn, or censoriousness, which speaks thus, but the voice of all Christian experience. It is recognised at once where the young are concerned: people are careful of the friends their children make, and a schoolmaster will dismiss inexorably, not only a bad habit, but a bad boy, from the school. It ought to be recognised just as easily in maturity as in childhood: there are men and women, as well as boys and girls, who distinctly represent evil, and whose society is to be declined. To protest against them, to repel them, to resent their life and conduct as morally offensive, is a Christian duty; it is the first step towards evangelising them.