"Iron sharpens iron, and one man sharpens another," Proverbs 27:17 tells us. God uses Christian friendships to help His children grow in grace and remain faithful to Christ. In contrast, our 21st-century Western culture values individualism, busyness, and selfishness: qualities that do not foster deep, lasting, and fulfilling friendships. The authors guide us through a practical overview of biblical and historical friendships, drawing principles from them that will help us foster our own biblical friendships, which will stimulate us in our Christian walk in a world that is no friend of grace.