Consider these verses in relation to the meal offering, representing the devoted keeping of the last six commandments. Hating a brother would be breaking those commandments in relation to him. It might involve murdering him, breaking the marriage bond through adultery, stealing from him, lying to or about him, or lusting after him or his possessions.
Verse 10 parallels Psalm 119:165 exactly when it says, "But he who loves his brother abides in the light, and there is no cause for stumbling in him." I John 5:3 defines love: "For this is the love of God, that we keep His commandments. And His commandments are not burdensome." The New Testament strongly affirms that loving one's brother is keeping God's commandments in relation to him, and this provides us strong assurance and stability along the way.
I John 2:11 then shows that the blindness of darkness envelops the eyes of one who hates his brother, that is, breaks God's commandments in relation to him. This blindness produces stumbling and fighting, and thus he has no peace.
It is particularly disturbing if the brother spoken of in these verses also happens to be one's spouse, father, or mother. Old people today stand a high chance of being shunted off into a convalescent or old-age home, if only for the convenience of the adult children. Is that honoring a parent, or is it in some way contemptuous? Are the children unwilling to make sacrifices even for those who brought them into the world? Will this course of action produce peace? Will it produce a sense of well-being in either party?
John says, "He who loves his brother abides in the light" (verse 10), implying that love produces its own illumination. Illumination is what enables a person to see in the dark. Light contrasts to the darkness, blindness, and ignorance of verse 11, which result in stumbling. Illumination indicates understanding and the ability to produce solutions to relationship problems. The difficult part is laying ourselves out in sacrifice to express love. If we fail to do this, we may never see solutions to our relationship problems.
John W. Ritenbaugh
The Offerings of Leviticus (Part Five): The Peace Offering, Sacrifice, and Love
Life without love is death because it is a life of selfishness, the opposite of what God is. John says it is like being blindfolded and having blurred judgment besides. Yet we have the love of God; He has shed it abroad in our hearts by His Spirit (Romans 5:5). This is not an abstract love for people in distant lands but is toward and for those with whom we have daily contact. God's love not only enables us to make progress in His way, it is the solution to the murder problem.
Hatred, the spirit of murder, destroys fellowship with God and man. If one has hatred toward another, it proves he does not love God. God is love. No one with the spirit of murder within him is in the image of God. Such an attitude must be overcome, for no murderer will enter His Kingdom.
John W. Ritenbaugh
The Sixth Commandment (Part One) (1997)
The source of murder comes from the heart (mind, the core of an individual's character) where hate and anger are festered by Satan. If we have these evil traits in our hearts, we are fostering the spirit of murder. Thought precedes action and hatred precedes murder. If we hate someone, we break the sixth commandment.
Martin G. Collins
The Sixth Commandment
Other Forerunner Commentary entries containing 1 John 2:9: