We are sent down to this world for a short period of time. This world is temporary, it is just the entry hall to the World of Truth, Olam HaBa. All our personal journeys are individually designed to ensure we find our way to the ultimate destination. The tougher the journey, the greater the reward will be at the end.
"They journeyed from Kivros-hata'avah and camped in Chatzeros" [Masei 33:17]
From this verse, remarked R' Yitzchak of Vorka, we learn that for an individual to break the yetzer hara within him, he must constantly recall the fact that this world is but a temporary one intended to be utilized in preparation for the World to Come.
This is hinted in the verse: "They left Kivros-hata'avah" - how will one be able to bury [likvor] his lust [ta'avah] and subdue his yetzer hara? By remembering that this world is no more than "Chatzeros", a yard [chatzer] in front of a house, a hallway leading to a palace."
A person who ingrains this thought in his heart, said the Rebbe, will triumph in his war against the yetzer hara.
Source: Rabbi Yisrael Bronstein