How do we know that the grace of our Lord Jesus Christ is sufficient?

According to 2 Corinthians 8:9, believers are called to know the grace of our Lord Jesus Christ, which compels us to understand the depth of His sacrifice and love. This grace is underscored by the transformative knowledge of His work on our behalf, as mentioned in Romans 8:28, where we learn that all things work together for good to those who love God. The assurance of His grace comes not only from personal experience but also through the collective witness of believers who have witnessed His faithfulness throughout history. His grace is sufficient because it is rooted in God's unchanging character.