Why is seeing by faith important for Christians?

Seeing by faith is important because it is through this sight that believers gain true joy and assurance in their relationship with Christ. While carnal sight can lead to despair and sorrow, faith opens the eyes of the heart to see the resurrected Jesus and experience the joy that comes from knowing Him. As noted in John 16:20-22, Jesus promises that their hearts will rejoice when they see Him again by faith, thus turning their sorrow into joy. This faith is a gift from God, enabling believers to grasp the eternal truths of their redemption and righteousness in Christ.