Love
Love is presented as the defining characteristic of God and His followers. It is both a command and a reflection of God's nature.
Love is central to the Christian faith, demonstrating God's essence and the expected behavior of believers. It underscores the relational aspect of God and His desire for His people to live in love.
In the Greco-Roman world, love (agape) was often seen as a selfless, sacrificial love, which was counter-cultural to the more common self-serving love.