At a decisive moment in his life, Jesus set out resolutely for Jerusalem. He did not turn back. In truth, his whole life was oriented toward that holy city, where he longed to reach the summit and give his greatest treasures: the Eucharist, his mother, his passion, his life-giving resurrection, and the Holy Spirit. This book explores the first of these treasures entrusted to believers in Jerusalem. Christ desires that the hearts of all be bound to them, for in them believers will never lose their way. He came down from heaven so that all might return to the Father. Let the readers, then, set out in search of the treasure.