SIB101854 wrote:
Shaar Daled-that is the core of Nefesh HaChaim.
Just for informational purposes, you may be right that shaar Dalet is the core of the NH because it discusses Torah learning, which is the core of the world, but I personally heard from Chacham R' Yaakov Hillel shlit"a, (I attended his in-depth shiur in Nefesh HaChaim for about 2 1/2 years), that the main purpose for which R' Chaim Voloszhiner wrote the NH in the first place, was to explain
[in Shaar Beis] his and (according to some opinions)the Gra's mehalech (I tried to write "s h itta" but the forum crossed it out as bad word) in the famous machlokes about "
Tzimtzum".