How do we know the doctrine of not loving the world is true?

The teaching that we should not love the world is firmly rooted in Scripture, particularly in 1 John 2:15-17 and James 4:4, where it is stated that friendship with the world is enmity with God. When we love the world, we align ourselves with its sinful desires, values, and principles, which are contrary to God's will. The world is described as being in wickedness (1 John 5:19), and therefore, to seek after it is to turn away from the love of the Father. Our allegiance should lie with God, who has redeemed us, rather than with a world that is sinful and passing away. Understanding this helps affirm the truth of this doctrine.