Rudolf Frieling's book, Agape: The Gone with the Gospel, explains the centrality of the Greek term "agápē" in the Gospel of John. The author asserts that agápē is not merely a feeling, but rather the most fundamental divine reality, a form of God's love made manifest through the person of Jesus Christ. In John's Gospel, God's love is always connected to the revelation of the Son. This love is the source and goal of the relationship between God and humanity (e.g., seen in Jesus' statement about His mission and in the command to love one another). Frieling concludes by emphasizing the practical consequences of this love for the lives of Christ's followers. The Christian community is called to reflect this divine agápē through concrete acts of devotion, service, and love.