Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him – 1 John: 2:15
Here are some commentaries on what the world system is.
The cosmos world is that system organised by Satan, headed by Satan and run by Satan, which leaves God out and is a rival.
– Charles C Ryrie
It is a moral and spiritual system designed to draw people away from God. It is a seductive system that appeals to all people, believers as well as unbelievers, and calls for our affection, participation, and loyalty. Satan controls this system, and believers should shun it.
– Stephen Smalley
It is that system that man has built up in this scene in which he is trying to make himself happy without God.
– H A Ironside