1 John 2:15-17 is a very important passage, it does two things, it prescribes what we should do and not do and second helps define one of the definitions of the word “world”. It says the following: “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. For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world. And the world passeth away, and the lust thereof: but he that doeth the will of God abideth for ever.“
I see two overarching concepts here: 1) Do not love the world 2) love not the things that are in the world. Concept two is broken down into three things. The first two seem to be broken down into both physical and nonphysical lust. Jesus makes application of this in Matthew five when he talks about murder and adultery (1). The third one tells us that pride is of the world and is sin.
To have the “love of the Father” in us, we need to flee immorality. If you are not a follower of Christ, repent and turn to him. If you are you are practicing unrighteousness, turn back to Christ. Idolatry, sexual immorality, strife, jealousy, fits of anger, homosexuality, divisions and wild parties are acts of immorality. Those who do these things “will not inherit the kingdom of God” (Galations 5:19-21; 1 Timothy 1:10).
(1) Matthew 5:21-28 Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment: But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire. Therefore if thou bring thy gift to the altar, and there rememberest that thy brother hath ought against thee; Leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift. Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison. Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing. Ye have heard that it was said by them of old time, Thou shalt not commit adultery: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.