Scriptural quotes that have had life-changing effects on historical figures include Romans 13:13-14 in the case of St. Augustine of Hippo and Matthew 10 in the case of St. Francis of Assisi. The quotes and speeches of Martin Luther King Jr. and Ronald Reagan also left a mark on history.
In his autobiography, "The Confessions," the early Christian theologian and bishop Augustine of Hippo describes the impact St. Paul's Letter to the Romans had on his conversion from a loose life to Christianity. Augustine had wandered from the faith of his mother and became involved with the Manicheans, who were considered heretics by the early church. He also kept a concubine. His autobiography reports that after reading St. Paul's admonition to reject the works of the flesh and embrace Christ, he felt inner peace and gained the strength to turn back to his Christian roots.
St. Francis of Assisi is well-known for his founding of the Franciscan Order on the principle of Christ-like poverty. Part of the inspiration for this radical poverty purportedly came from Francis hearing Jesus' admonition to go and preach the Gospel without any possessions on hand, as recorded in Matthew 10.
Martin Luther King Jr. helped change attitudes towards race through his many speeches, including quotes from "I Have A Dream." President Ronald Reagan caused an uproar with his demand for Gorbachev to tear down the Berlin Wall.