Chuck Smith emphasizes the role of believers as watchmen, drawing from Ezekiel 3:17, where God calls Ezekiel to warn Israel of their wickedness. He highlights that the responsibility of Christians is to hear God's word and share it, not to convert others, as that is the work of the Holy Spirit. Smith encourages believers to recognize their duty to serve God and warn others of the consequences of sin, asserting that delivering the message is fulfilling their responsibility. He reassures that even if people mock or dismiss the warning, the truth will remain with them. Ultimately, serving God is not optional but a divine mandate for all Christians.