J.R. Miller emphasizes that true loyalty to Christ begins in the heart, requiring supreme love for Him above all else. He warns against the danger of being overly active in church work while neglecting a personal relationship with Christ, as seen in the church of Ephesus, which lost its first love. Miller illustrates that loyalty involves both heart devotion and a life that reflects Christ's character, urging believers to maintain sincerity and truth in their lives. He encourages Christians to find their unique service to Christ, highlighting that both being and doing are essential aspects of active faith. Ultimately, loyalty to Christ is about being faithful, true, and obedient to His will in every aspect of life.