How do we know that Christ opens our understanding?

Scripture assures us that Christ is the one who reveals the deeper truths of God. In 1 John 5:20, it's articulated that the Son of God has come to give us understanding. This underscores the idea that understanding is not a mental exercise reliant on human effort; rather, it is a divine revelation. Paul further affirms this by showing that the natural man cannot know the things of God unless illuminated by the Spirit (1 Corinthians 2:14). Therefore, it is Christ who instills faith and understanding, emphasizing that the capacity to believe is a gift rooted in grace.