I John 2:9

There is no mean between light and darkness, love and hatred, life and death, God and the world: wherever spiritual life is, however weak, there darkness and death no longer reign, and love supplants hatred; and Luk 9:50 holds good: wherever life is not, there death, darkness, the flesh, the world, and hatred, however glossed over and hidden from man's observation, prevail; and Luk 11:23 holds good. "Where love is not, there hatred is; for the heart cannot remain a void" [BENGEL]. in the light--as his proper element. his brother--his neighbor, and especially those of the Christian brotherhood. The very title "brother" is a reason why love should be exercised. even until now--notwithstanding that "the true light already has begun to shine" (Jo1 2:8).

Here the apostle encourages against sins of infirmity (Jo1 2:1, Jo1 2:2), shows the true knowledge and love of God (Jo1 2:3-6), renews the precept of fraternal love (Jo1 2:7-11), addresses the several ages of Christians (Jo1 2:12-14), warns against worldly love (Jo1 2:15-17), against seducers (Jo1 2:18, Jo1 2:19), shows the security of true Christians (Jo1 2:20-27), and advises to abide in Christ (Jo1 2:28, Jo1 2:29).

2:9-11 Another indication of truly knowing Christ is one’s treatment of other Christians. John is again pointing to those who claim to be spiritually enlightened but separate themselves from other Christians with an attitude of superiority. John defines such an attitude as hatred. 2:9 a fellow believer: Literally his brother. The Greek word adelphos (also in 2:11) is a generic term often used to refer to both male and female members of the same family.