What does 1 John 3:13 mean?

John extends his discussion of hate from verse 12. John's audience, apparently, was already experiencing some level of persecution. While some considered this persecution a surprise, John warned them to expect it. His teaching reflects Paul's words in 2 Timothy 3:12: "Indeed, all who desire to live a godly life in Christ Jesus will be persecuted." The reason for this persecution is the same reason Cain killed Abel: because the world is evil and it hates goodness. There is a hateful jealousy in sin, which despises seeing others do what is right.

Jesus taught, "Blessed are those who are persecuted for righteousness' sake, for theirs is the kingdom of heaven" (Matthew 5:10). Such people will be rewarded (Matthew 5:12). Jesus also taught, "If they persecuted me, they will also persecute you" (John 15:20). As opposed to the claim that salvation will make all of our earthly trouble vanish, the gospel implies that loving God means being hated by the world.