What does the Bible say about the importance of sound doctrine?

The Apostle Paul urges Timothy to retain sound words and teachings he received, emphasizing the vital role of sound doctrine in the life of a believer. In 2 Timothy 1:13-14, Paul instructs Timothy to guard the good deposit entrusted to him, highlighting that sound doctrine not only preserves faith but also ensures believers remain anchored in the truth amidst challenges. Sound doctrine provides a foundation that nurtures our faith and helps resist the false teachings prevalent in the world.