For 12 years, Rabbi Shimon bar Yochai (Rashbi) and his son Elazar dwelt in the cave, sustaining themselves on carobs and water. In the cave, Rabbi Shimon learned to look at the world in even the most physical and coarse places and still find Hashem and His Goodness within. For, the physicality itself is really hidden, latent spirituality. By coming to this realization, Rashbi was thus zocheh to reveal Hashem in every aspect of creation (the good and the bad) through the mystical teachings contained in the Zohar. He came to a place of shalom between him, those around him, and His Creator, and thereby became the conduit of shalom into the world. I’ve heard it said that when someone learns the Zohar properly, all questions fall away.