David Wilkerson warns about the peril of drifting away from Christ, emphasizing that even the most devoted believers can become complacent and lose their intimate connection with God. He reflects on the history of God's people, noting how they often forget the Lord and fall back into old ways, as seen in the example of Moses and the Israelites. Wilkerson encourages believers to examine their hearts and rekindle their relationship with Christ, reminding them of the importance of staying true to God amidst a culture of apostasy. He highlights that those who remain faithful will experience the fullness of God's presence and blessings.