Don't love the world, neither the things that are in the world. If anyone loves the world, the Father's love isn't in him.
"If" assumes that some Christians will love the world (third class condition in Greek), which is unfortunately often true to reality. One writer responded to the question of many, "What’s so bad about the world?" [Note: Yarbrough, pp. 128-37.] "The love of the Father" is probably the believers’ love for the Father (objective genitive), not His love for us (subjective genitive). [Note: Robertson, 6:214.] "In him" again reflects a controlling influence (cf. 1 John 1:8; 1 John 2:4).