Good commentaries should ask and answer questions that enable people to see things for themselves, and probe into reality, not just verbal relations.

What drives John Piper? “This is one of the greatest discoveries of my life,” he recent told an audience in Italy, “that God’s purpose to be glorified and my passion to be satisfied are not at odds.”

Teachers need to be vigilant over what they teach, and all Christians need to be vigilant over what they do with what they are taught.