We begin to see, in verse 14, what produces this dichotomy. "I have given them Your word; and the world has hated them"—a separation begins to occur—"because they are not of the world."
So, here we find ourselves in the world, but not of it. This was produced because we have heard the gospel and responded to it. This has produced a separation from conformity to the world; and, if continued in a person's life, it will also produce a separation from the evil of this world.