A person's feeling that he is moving towards the goal. Yerushalayim is called Hashem's place of tranquility. Fullfilling Hashem's desire: Attachment to Him. Shabbos - tranquility in time. Until Noach, the world did not have rest. The interdependence of menuchah (rest) and nechamah (comfort). Our only purpose - being close to G-d. Difficulties? Maybe... Sadness? NEVER!