'Iron sharpeneth iron; so a man sharpeneth the countenance of his friend,' Proverbs 27:17 tells us. God uses Christian friendships to help His children grow in grace and stay true to Christ. But our twenty-first-century Western culture values individualism, busyness, and selfishness qualities that do not encourage deep, long-lasting, satisfying friendships. The authors guide us through a practical survey of biblical and historical friendships, drawing principles from them that will aid us in forming our own biblical friendships that will sharpen us for our Christian journey in a world that is no friend to grace.