The central message of this sermon is that knowing God is not about seeing or experiencing Him in some tangible, empirical way, but rather about understanding and relating to Him through His Son, Jesus Christ. The speaker argues that our finite and sinful nature makes it impossible for us to directly apprehend God, and therefore, God has chosen to communicate Himself to us through the person of Jesus, who perfectly represents the Father in human form. This message advances the belief that God's nature is not abstract or unknowable, but rather, He has made Himself known to humanity through His Son, and we can come to know Him by looking at and relating to Jesus. The takeaway from this sermon is that true understanding of God comes not from intellectual or philosophical pursuits, but from a personal relationship with Jesus Christ, who embodies the character and nature of God in human form.