The world is the system of every age, the philosophy that opposes the things of God. The world is forever brainwashing, seeking to squeeze people into their mold. If the Bible calls for something, most often the world will be against it. The world will persecute people that oppose its standard. Nobody opposes the world more than Jesus. In biblical times confessing Jesus would put you out of the synagogue. Now confessing Jesus will put you out of the good graces of politics, Hollywood, the press, academia and personal acquaintances.