John Piper has been a friend – a good and faithful friend – for more than 40 years. I thank God for his remarkable worldwide ministry, his evident deep love for God, his faithfulness to every word of Scripture, and the way his life of self-sacrifice continues to provide a challenge to me personally. When we have opportunities to be together, I enjoy every minute of conversation with him. I pray for him regularly, as I believe he does for me. I agree with probably 98% of everything he has written and said during his entire ministry. But he and...