Why is it important to rejoice in our names being written in heaven?

In Luke 10:20, Jesus instructs His followers to rejoice not in their authority over demons, but rather because 'your names are written in heaven.' This speaks to the profound assurance believers have in their salvation. The doctrine of the assurance of salvation teaches that when one believes in Christ, their name is eternally inscribed in the Book of Life, which signifies a relationship sealed by God's grace. Knowing that God has chosen us and granted us eternal life through Christ allows believers to find true joy amidst life's challenges, emphasizing God’s sovereignty and the permanence of His promises.