Geula - exile with the letter "aleph"
Therefore, the realization of the idea of Liberation depends on "all our works and our service throughout the entire time of exile", the work of introducing the letter "aleph" into the exile itself.
Moreover, this is the essence and meaning of Liberation [also those aspects of Liberation that are higher than the world and exile - changing the order of the universe on the example of the awakening of the dead] - "the obvious revelation of the infinite light [of the Most High], blessed be He, in this material world", until the habitation for the Most High in the lower spheres, for Him — for His Essence is fulfilled.
As stated in Tanya, ch. 37: “The fulfillment of this perfection of creation at the time of Moshiach and the resurrection of the dead, etc. depends on our works and our service throughout the time of exile.” And it must be said that "the times of Moshiach" refer to the first period (when "the accepted order in the world does not change"), and "the resurrection of the dead" refers to the second period.
Therefore, the realization of the idea of Liberation depends on "all our works and our service during the whole time of exile", the work of introducing the letter "aleph" into the exile itself, until with this it turns into Liberation. The word "exile" ("goal" -גולה) is written in the same way as the word "liberation" ("geula" -גאולה) with the letter "aleph" in the middle.
Except that the (great uplift) of Liberation comes by the descent into exile [like the opening of the intense light of the soul by its descent down]; Liberation is made from exile itself—the dwelling place for the Supreme below. And this is the reason why “one hour of repentance and good works in this world is better than a whole life in the world to come” (Tractate “Teaching of the Fathers” 4:17) because of the dignity of work precisely “in this world” ...