The month of Kislev is ideal for the study of and dissemination of Chassidus.
The idea of spreading Chassidus outward is similar to the idea of Jacob leaving the comfort of the holiness of Isaac, and Yeshiva, to teach the world
Just as Jacob managed to fulfill his mission specifically in the darkest location, so to, the lower the Torah goes, the higher it gets.
Through Jews studying Torah, the Torah goes beyond wisdom to integrate Infinity.
When Moshiach comes it says that “the Torah will come from me” which is Infinitely greater than the current level.
Just as Jacob going down, it was an order to go higher, so to, the Torah, every time it goes lower, it’s only to go higher.
An example of this is the destruction of the first Luchois, as God told Moses “regret it not, because in the second one, will be infinitely more.”