Why is it important for Christians to understand Christ's successful mission?

When Christians grasp that Christ's mission was successful, they can find peace and confidence in their salvation. This understanding dispels doubts and fears, affirming that salvation does not depend on their efforts but on Christ’s accomplished work. Moreover, it highlights the character of God in securing His elect, reflecting His mercy and unfailing love. By appreciating the full scope of Christ's victory over sin and death, believers can worship with joy, knowing they are secure in Him. This assurance is fundamental to living a life of faith and service.