Romans 6:19 — Just as children grow up to become adults, so too new believers will grow up in Christ. As Dr. Martyn Lloyd-Jones describes in the sermon from Romans 6:19 titled “The Infirmity of the Flesh,” Paul uses an illustration. It is rare for Paul to tell a story or use an analogy, but he chose to do so by relating that Christians are now slaves to righteousness instead of slaves to sin. In Romans 6:19, he clarifies by saying, “I speak after the manner of men.” Dr. Martyn Lloyd-Jones points out that this specific verse is Paul explaining why he uses an illustration to make his subject matter simple and clear. Dr. Lloyd-Jones remarks that this should be the only use of illustrations for any teacher or preacher of the Bible. Paul also notes that he only used the illustration so that others would not misunderstand what he was saying. He wants to emphasize that righteousness combines both slavery and freedom: slavery to righteousness but a freedom from the reign of sin. Paul chose to use an illustration because some of his listeners are still children in a sense of Christianity. Dr. Lloyd-Jones goes on to warn that believers should never stay children of the word of God only drinking milk, but instead should constantly be growing and maturing to take in the meat of the gospel.