Vs. 7, “I say this because many deceivers, who do not acknowledge Jesus Christ as coming in the flesh, have gone out into the world. Any such person is the deceiver and the antichrist.” Why should I know the Bible and truth? Because we have a responsibility to know how to discern that which is false vs. that which is truth. Knowing and living truth are essentials to be able to not be led astray. Some of us cannot possibly imagine others coming with evil intentions to the church. But the enemy is not about playing under our system of rules. These were warnings in the early church. Jesus predicted as the end times draw nearer, it will get even worse (Matthew 24).
Regarding application…Know the Truth. Vs. 10, “If anyone comes to you and does not bring this teaching, do not take them into your house or welcome them.” Many of us may think this doesn’t happen today. However, there are actual occults that will send out members to churches with the sole purpose of infiltrating small home fellowships in the churches. Their intention is to gain the trust over an extended period of time and then lead them to their false teaching and eventual occult. There was a recent movement in the Korean churches all over Southern California. It got big enough to where Talbot Seminary sent out all points bulletin to each student warning us about this occult. The more we know the truth, the more we will be able judge and discern what the Apostle John so adamantly warns us against.