The story of Belshazzar's party in the face of death serves as a reminder of God's ultimate judgment and the importance of living a life that honors Him. The writing on the wall, interpreted by Daniel, reveals the Babylonian king's sin and the consequences of not worshiping God as God. The message is a call to all people to consider their own mortality and the need for a word from God, which can only be found through a relationship with Jesus Christ.