“Do not love the world or the things in the world.” The word of God and human nature itself command us to love the world, or the universe, as the most excellent creation of God for man’s need and delight. Therefore one both can and must love the world as God’s most beautiful creation. God Himself implanted in our nature the ability and need to know and love truth, beauty, and goodness in the world, and to use the gifts of His grace in the world with love and gratitude toward Him.
But because of man’s sin, nature changed in its relation to man, and man changed in relation to nature. The world, together with man, came to be in evil and in sin. In this sense it is said that the world lies in evil (cf. Jn 5:19 and the note). Since man must not love evil and sin, he must not love the world either. For this reason the Apostle says, “Do not love the world.”
“So that you do not understand by the world the totality of heaven and earth, the Apostle explains what the world is and what is in the world. First, by the world he means depraved people, who do not have the love of the Father within themselves. Second, by what is in the world he means what is done according to the lust of the flesh, which acts through the senses and arouses lust” (Theophylact).
Man must love God with his whole soul, but he must not love the world insofar as it is sinful and in evil. Thus man stands between them and must choose between them: either love for God or love for the world. He must serve either God or mammon (Mt 6:24 and the note). God and the world have become opposites for man, so that friendship with the world is enmity against God. Whoever wishes to be a friend of the world becomes an enemy of God (Jas 4:4; cf. the note).
Thus if there is no sinful attachment to the world in a man, he may use and take comfort in all its gifts. But as soon as he clings to it and begins to love it, it becomes sinful and evil for him. It must not be loved, as sin and as evil must not be loved.
The same applies to everything that is in the world, to all the objects of the world, to all people, to all animals, and in general to all creatures. Whoever loves anything or anyone more than God is unworthy of God and His love (cf. Mt 10:37 and the note).
Yet for the pure, all things are pure. One can and must use everything without sin, as pure, to the glory of God (Tit 1:15). The measure of using the world as good is the measure of love for God. If you love Him, everything is holy and pure. If you do not love Him, everything is sinful, depraved, or evil. Of course, the statement is made absolutely instead of relatively.
“Whoever loves the world,” and so forth. Whoever clings passionately to the world thereby bears witness that he does not love God. Whoever does not love God is not loved by God. Therefore the love of God does not rest upon him, or does not abide in him.
“Do not love the world,” for all that is in the world is not from the Father, but from the world. In other words, do not love evil, for it is not from God, but from evil itself, or from its author, the devil. Whoever loves it or clings to it clings to the devil and withdraws from love for God and from God’s love for him.