This short book, inspired by 1 Corinthians 13, applies Christian ideas of love to social relations, arguing that only an increase in love can lead to social progress. Rauschenbusch examines where love breaks down in modern society, and finally shows out how ideas of love and freedom point to the Kingdom of God.
Walter Rauschenbusch (1861–1918) was a Baptist pastor and important figure in the Social Gospel movement. He co-founded The Brotherhood of the Kingdom, a group of thinkers advocating social change. His writings influenced Martin Luther King Jr., Desmond Tutu, and multiple social justice ministries.