David Wilkerson emphasizes that true peace and happiness cannot be found in others but only through a personal relationship with Jesus Christ. He highlights the futility of relying on human counsel, likening it to broken cisterns that cannot hold water, and instead points to the Holy Spirit as the ultimate source of strength and joy. Wilkerson encourages believers to recognize the divine power within them, which can lead to a life overflowing with peace and fulfillment. He reminds us that by accepting Jesus as Lord, we can access the fullness of the Spirit and experience everlasting life.