I UNDERSTAND this, first, in this sense: be separate unto Christ. These men were to leave their pursuits; they were to leave their companions; they were, in fact, to quit the world, that their one business might be, in their Master’s name, to be fishers of men. We are not all called to leave our daily business, or to quit our families. That might be rather running away from the fishery than working at it in God’s name. But we are called most distinctly to come out from among the ungodly, and to be separate, and not to touch the unclean thing. We cannot be fishers of men if we remain among men in the same element with them. Fish will not be fishers. The sinner will not convert the sinner. The ungodly man will not convert the ungodly man; and, what is more to the point, the worldly Christian will not convert the world...
I believe that one reason why the church of God at this present moment has so little influence over the world is because the world has so much influence over the church.... They plead that they may live like worldlings, and my sad answer to them, when they crave for this liberty, is, “Do it if you dare. It may not do you much hurt, for you are so bad already. Your cravings show how rotten your hearts are. If you have a hungering after such dog’s meat, go, dogs, and eat the garbage. Worldly amusements are fit food for mere pretenders and hypocrites. If you were God’s children you would loathe the very thought of the world’s evil joys, and your question would not be, ‘How far may we be like the world?’ but your one cry would be, How far can we get away from the world? How much can we come out from it?’”...
The worst day the world ever saw was when the sons of God were joined with the daughters of men. Then came the flood; for the only barrier against a flood of vengeance on this world is the separation of the saint from the sinner. Your duty as a Christian is to stand fast in your own place and stand out for God, hating even the garment spotted by the flesh, resolving like one of old that, let others do as they will, as for you and your house, you will serve the Lord.
SPURGEON.