In anticipation of the fulfillment of God's promises, believers are encouraged to live lives that reflect their faith and hope. The call to be 'spotless' and 'blameless' highlights the importance of striving for purity and integrity in both actions and thoughts. This is not about achieving perfection but about making a sincere effort to live in a way that honors God. Being 'at peace with him' suggests maintaining a harmonious relationship with God, which involves aligning one's life with His will and seeking His guidance in all things.
This verse emphasizes the importance of personal holiness and peace as Christians await the return of Christ. It serves as a reminder that the anticipation of God's promises should inspire believers to live in a way that reflects their commitment to Him. By making every effort to live according to these principles, believers demonstrate their faith and readiness for the future God has promised. This passage encourages Christians to focus on their spiritual growth and relationship with God, ensuring they are prepared for His coming.