“The Citadel” is Exupéry’s main book. He wrote it during the last eight years of his life, before his death in 1944. Written in the language of parables and metaphors, the book contains the cherished wisdom of the human heart and the boundlessness of divine revelation. To hear the book is like embarking on an inner ascent up a mountain peak, to take a pearl from the bottom of the sea— not granted to everyone, but everyone can try to do it (perhaps more than once): the joy of conquering the peak or the shining pearl will be real.