How do we know that Jesus' sacrifice is effective for our salvation?

The effectiveness of Jesus' sacrifice for our salvation is rooted in its fulfillment of God's covenant promises. John clearly states that the blood of Jesus Christ cleanses us from all sin (1 John 1:7). This cleansing is not just a concept but is based on God's faithfulness to His Word. When we confess and rely on the merits of Christ's blood, we experience the application of that salvation in our hearts. Thus, His sacrifice is just and sufficient for the forgiveness of sins as it honors the covenant agreement between the Father and the Son, confirming the promise that all who believe will be saved.