How do we know Christ is the key to all knowledge?

In the sermon, it is emphasized that Christ is the key to understanding God and His will. The phrase 'the key of knowledge' signifies that one cannot know the Father except through the Son, as stated in Matthew 11:27. Self-righteous religion takes away this knowledge by focusing on human efforts rather than on Christ’s finished work. Without recognizing Jesus as the revelation of God, people cannot have true insight into spiritual matters. This ignorance leads to misconceptions about salvation and the role of faith, emphasizing that Christ and His gospel are essential for true understanding.