David Wilkerson emphasizes that while the Old Testament provided glimpses of God as Father, it was through Jesus that the full revelation of the Father was made known. He highlights that Jesus' actions and teachings were meant to illustrate the nature of the Father, showing His love, mercy, and grace. Wilkerson points out that the prophets longed for this revelation, which is now available to this generation. By understanding the Father through Christ, believers are called to reflect His character in their lives, inviting others to witness the Father through their actions.