I am writing to you fathers, because you have known Him [i.e., Christ], [who has existed] from the beginning [See John 1:1]. I am writing to you young men, because you have overcome the [power of the] evil one [i.e., through faith they had gained victory over Satan, See 5:4].

not [hate each other] the way Cain did, who belonged to the evil one [i.e., Satan], when he murdered his brother [Abel]. And why did he murder him? It was because his [own] actions were evil and his brother's were righteous [See Heb. 11:4].

[But], you people are [followers] of God, little children [i.e., dear ones], and you have overcome them [i.e., these false teachers] because He who is in your lives [i.e., the Holy Spirit, See 3:24] is greater [i.e., more powerful] than he who is in [i.e., dominates] the world [i.e., Satan. See II Cor. 4:4].

We [who preach the true Gospel] represent God; the person who knows God listens to our message; the one who does not belong to God does not listen to us. This is how we can know [the difference between those speaking by] the Holy Spirit of truth and [those speaking by] the spirit of [Satan's] error.

We know that every person who has been [spiritually] conceived [by God and eventually born] does not continue in [a life of] sin, but God's one and only conceived [Son] keeps him [from continuing to sin], and the evil one [i.e., Satan] does not continue to touch him [i.e., continue to control his life].

We [also] know that we are [children] of God and that the people of the whole world lie under [the control of] the evil one [i.e., Satan].