Why is it important for Christians to understand true doctrine?

True doctrine is crucial for the Christian life as it provides the foundation upon which believers build their faith. In 1 Timothy 4:1, Paul emphasizes the danger of deviating from sound teaching and the impact it has on a believer's walk with the Lord. Sound doctrine aligns with the truths of Scripture and the nature of God revealed through Christ. It serves as protection against false teachings that could mislead individuals. Thus, Christians are called to diligent study of the word and to guard against doctrines that do not align with the truths of the Gospel.