The Writing on the Wall concerns a partly autobiographical example of a real modern-day miracle that Justin Brent Wallace received only as a result of daring to completely trust and effectively discern the voice of the Holy Spirit. This also proved to him God's existence beyond doubt. Herein, the author reveals and discusses all the relevant circumstances, showing the proof of God's existence and analyzing the result, hoping to teach others how to better see and discern the Holy Spirit's presence in their lives. He urges the reader to apply what he reveals, supported by numerous Bible verses. Heeding the Holy Spirit's voice leads to rewards of greater faith and knowledge of God as well as the assurance of living his will.