'World' in the Bible

He hath made every thing beautiful in his time: also he hath set the world in their heart, so that no man can find out the work that God maketh from the beginning to the end.

Though the stillborn child came into the world for no reason and departed into darkness, though its name is shrouded in darkness,

While applying my mind to everything that happens in this world, I have seen all this: Sometimes one person dominates other people to their harm.

Whatever the activity in which you engage, do it with all your ability, because there is no work, no planning, no learning, and no wisdom in the next world where you're going.

So enjoy yourself in your youth, young man, and be encouraged during your younger days. Live as you like, consistent with your world view, but keep in mind that God will bring you to account for everything.