In "Knowing How to Be Poor," Washington Gladden delves into the Apostle Paul's contentment in all circumstances, focusing on the profound peace that comes from a deep relationship with God. Gladden emphasizes that true wealth is found not in material possessions but in the assurance of God's presence and love. He argues that even in poverty, one can live a fulfilling life by trusting in God's care, drawing on the examples of Jesus and Paul to show that a life rooted in faith is the greatest treasure of all.