J.R. Miller emphasizes the necessity of 'silent times' in the Christian life, where individuals can retreat from the busyness of daily activities to commune with God in prayer and meditation. He highlights that while active service is essential, it must be balanced with periods of devotion to sustain spiritual vitality. Miller encourages believers to establish daily quiet moments to recharge spiritually, drawing strength from God to effectively serve others. He warns against the dangers of relentless activity without spiritual nourishment, advocating for a life that integrates both devotion and duty. Ultimately, these silent times are crucial for personal growth and effective ministry.