IN HIS FIRST APOSTOLIC EXHORTATION, Pope Francis wrote: "We need to recover a contemplative spirit." The Meaning of Blue is about just such a recovery. Blue is the color of heaven, of purity and truth. Its rarity in naturally occurring substances on earth and its abundance shining in the sky speak of the same thing: a celestial light to which our culture is increasingly blind. With examples drawn from both the inspired ambiguity of poetry and the...