Studd believed that God's purposes could be confirmed through providential coincidences, such as a sum of money being donated spontaneously at just the right moment. He encouraged Christians to take risks in planning missionary ventures, trusting in God to provide. His spirituality was intense, and he mostly read only the Bible. Another work that influenced him was Hannah Whitall Smith's "The Christian's Secret of a Happy Life". Although he believed that God sometimes healed physical illnesses through prayer and the anointing of oil, he also accepted that some ailments were chronic, and in his last years he regularly took morphine, causing some controversy. Studd also believed in plain speaking and muscular Christianity, and his call for Christians to embrace a "Don't Care a Damn" (DCD) attitude to worldly things caused some scandal. He believed that missionary work was urgent, and that those who were unevangelised would be condemned to hell.