God is Light and God is Love
God is Light 1 John 1:1 through 1 John 3:10
God is Love 1 John 3:11 through 1 John 5:21
The Message
The absence of love in the life of a child of God is inconsistent with the message of love that has been proclaimed to them
agapōmen (“we should love”) calls for a continuous display of love in the family of God. Christian love is fundamental to being a child of God.
The Murder
The adjective ponerou (“evil”) indicates the active exercise of evil in one’s behavior.
John uses the word esphaksen (“to butcher, slay, murder”; lit., “to cut the throat”) to portray the brutal violence of the event.
The Motive
The subsequent answer, “Because his own actions were evil and his brother’s were righteous,” contrasts the two deeds and character of the two brothers. The righteous acts of Abel provoked the jealousy of Cain, which digressed into hatred and eventually murder.
“Jealousy—hatred—murder is a natural and terrible sequence.”
The Mindset
Hatred continues to be the reaction of the world toward the children of God. John uses the word “world” (kosmos) here as he did in 2:15, indicating that evil is an organized system in opposition to God and under the control of the devil.
For the first and only time, the apostle addresses his readers as “brothers” (adelphoi), a term denoting the unity that characterizes the community of faith.9 John places himself on the same level as his hearers. As their brother, John knows what it means to be hated by the world.
Just as love is the defining characteristic of the child of God, so hatred is the natural response of the world toward righteousness.
“The child of God … must be prepared for the enmity of the ‘world.’ For the fact is that those who belong to the world recognize neither God, nor those who belong to him.”