Why is the concept of Jesus not failing important for Christians?

Understanding that Jesus cannot fail provides immense comfort and assurance to believers. It implies that all that He has undertaken for our salvation will be accomplished without defeat. This gives hope to Christians that they can trust Him wholly for their eternal destiny. Additionally, it emphasizes the grace of God which cannot be frustrated, assuring us that God's purposes for His covenant people will prevail. In Isaiah 42:4, we see the promise that Christ will not be discouraged until He has established justice, reinforcing His commitment to His people and the fulfillment of God’s covenant.