When the world needed rain, Rebbe Shimon Bar Yochai expounded upon the verse, "How good and how pleasant is the dwelling of brothers together," and drew abundance down into the world. "The dwelling of brothers" alludes to the rectification of brotherhood, which did not positively manifest in the relationship between Cain and Abel or Jacob and Esau. The rectification is to learn what brotherhood means through pairs of brothers who did manifest brotherly love. The rectification of brotherhood in the world is one of the objectives of the redemption. It has the power to bring abundant blessing to the entire world.