'World' in the Bible

But I am hard-pressed between the two. I have the desire to leave [this world] and be with Christ, for that is far, far better;

so that you may prove yourselves to be blameless and guileless, innocent and uncontaminated, children of God without blemish in the midst of a [morally] crooked and [spiritually] perverted generation, among whom you are seen as bright lights [beacons shining out clearly] in the world [of darkness],