When Karl Barth, one of the sharpest and most significant theological minds of the 20th century, was asked towards the end of his life to try to summarize all that he had learned and written in his volumes of writing and career in academia, he responded with this: “Jesus loves me, this I know, for the Bible tells me so.” J.I. Packer writes, “you sum up the whole New Testament teaching in a single phrase, if...