The arrival of a Levite at Micah's home sparks a profound sense of religious validation and joy. The primary approach among commentators is that Micah views this opportunity as a clear sign that his actions are pleasing to God.
Up until this moment, Micah felt like an ordinary Israelite, and appointing his own son to serve as a priest was improper. The sacred duties of the priesthood are strictly reserved for the members of the tribe of Levi. With a legitimate Levite now present, Micah expresses complete faith that God will help him and bring him good fortune.
Because he has secured a man from the very tribe set apart for God's service to act as a true priest, Micah feels a deep sense of religious security. He is fully convinced that his private shrine is finally established correctly and appropriately, ensuring that he will receive ultimate blessing from God.