J.R. Miller emphasizes that the true measure of living is usefulness, as demonstrated by the fruitfulness of a Christian life that blesses and helps others. He argues that fruit is not for mere appearance but serves to satisfy the needs of others, highlighting the importance of small acts of kindness and encouragement. Miller illustrates that true helpfulness is not about monetary aid but about instilling strength and hope in others, fostering their growth and character. He encourages a life of service, reflecting the nature of God and Jesus, who came to serve rather than be served. Ultimately, a life dedicated to helping others enriches both the giver and the receiver, creating a cycle of love and support.