Thus, it has been explained above in the name of the Tikkunim, that six Sefirot nest in Yetzirah. Thus, when a ruling is lenient and the object in question is permitted for use, it enables the individual, through utilizing it in the performance of a mitzvah, to cause it to ascend to G-d. This is an act of severity. It is from the Shechinah which is clothed in the shrine of the Holy of Holies of each and every general or particular World that light and vitality are extended and diffused to that whole World and the creatures contained therein - the souls, angels, and so forth. This is also the purpose of the Shechinah - revealing to the world a light which is essentially higher than the world.
Parentheses are in the original text.
Iggeret HaKodesh, on the third page of Epistle 25. 7. Possibly, he says, this was added in order to anticipate a question that might arise from chapter 23 above. This indicates that Torah is wholly one with G-d Himself. The Rebbe Shlita also cites the Alter Rebbe's second note to chapter 40, which says that the core and the essence of the Supreme Will is in Atzilut, and only a glow therefrom radiates to each World according to its rank. The Rebbe Shlita provides an additional answer, which because of its complexity will be presented in capsule form.