How do we know Christ's work for our sake is effective?

The effectiveness of Christ's work for our sake is evidenced in Scripture, particularly in Hebrews 10:14, which states that by one offering, Christ has perfected for all time those who are being sanctified. This underscores the idea that Christ's sacrificial death not only secured forgiveness for sin but also established a perfect righteousness for believers. His accomplished work provides a firm foundation for assurance, as it is rooted in His identity and character as the Son of God. Through His death and resurrection, believers are assured of their place in God's family and the perfection of their standing before Him.