Why is the warning in Matthew 7:21-29 important for Christians?

This warning serves as a wake-up call for believers to avoid complacency and to examine the depth of their faith. It emphasizes that a mere verbal profession or outward activity does not suffice for salvation. The distinction between true believers and false converts underscores the importance of internal transformation and genuine relation with Christ. By highlighting that many will claim to serve Him but lack true knowledge, the passage encourages believers to diligently seek to know Christ and demonstrate their faith through obedience and trust in His work rather than their own efforts, ensuring their foundation is firmly built upon the rock of Christ.