Lance discusses the principle of supply in Ephesians 4:16, emphasizing that every member of the body of Christ has a role to play in contributing to the whole. He highlights the importance of being built together with other believers, arguing that individual strength is insufficient without community. The church is likened to a body where each part must function properly for the whole to thrive. Lance stresses that true fellowship involves sharing what we have received from the Lord, not merely our natural abilities. He warns against spiritual sterility, which occurs when believers take in but do not give out. The principle of supply is rooted in the idea that as we give what we have received, we will receive more in return. Lance encourages believers to engage actively in their local church, contributing both spiritually and practically, and to recognize that their relationships with one another are essential for spiritual growth. He concludes with a call to action, urging everyone to be a joint of supply, fostering a vibrant and functioning body of Christ.