Why is it important for Christians to know how sin is taken away?

According to 1 John 3:5, believers know that Jesus was manifested to take away their sins. This knowledge is crucial as it reinforces the doctrine of atonement and the sufficiency of Christ's sacrifice. Every believer recognizes that their sin is removed completely and unilaterally by Christ's blood — they do not contribute to this process. This truth liberates Christians from the burden of self-reliance in their salvation, emphasizing that salvation is a work of God alone, ensuring that their hope rests solely on Christ's accomplished work.