The world we live in is a corrupt, putrifying sespool in the power of the evil one. But thankfully, Jesus is saving people out of this wicked world and making them new creations. But if He's saved you out of the world, He now expects you to be like salt and make an impact on the world around you. Too many professing Christians go either to the extreme of thinking they need to become like the world, or the extreme of isolating themselves from the world. But if we are to be salt, we must both be different from the world, and yet still make contact with the world.