How does brotherly hate reveal our spiritual condition?

In 1 John 2:9-11, the text makes a stark contrast between love and hate, indicating that hate towards a brother is synonymous with walking in darkness. This assertion highlights that a lack of love toward fellow believers reflects a deeper spiritual deficit—a sign that one has not comprehended the depths of God's love for them. If one's life is characterized by hatred or indifference, it serves as an indicator that they remain unregenerate and have not experienced the transformative grace that leads to genuine love for others. Thus, brotherly hate is a serious concern, acting as a warning to examine one's faith and spiritual state before God.