Walking in the light is a metaphor for living a life aligned with the teachings of Jesus, characterized by love, truth, and righteousness. This passage emphasizes that claiming to be in the light is not enough if one's heart harbors hatred towards others. Hatred is seen as a sign of spiritual darkness, indicating a disconnect from the true essence of Christian faith.
The call to love one another is central to Christian doctrine. It reflects the love that God has for humanity and the love that Jesus demonstrated through His life and sacrifice. By loving others, believers reflect God's light in the world. This verse challenges Christians to examine their relationships and attitudes, encouraging them to replace hatred with love and forgiveness. It serves as a reminder that true faith is demonstrated through actions and relationships, not just words or beliefs. Embracing love over hatred is a step towards spiritual maturity and a deeper connection with God.