What is the purpose?

The One Above desires to dwell in things below.

Meaning that a breath of G‑dly life descends below and dresses itself in a body and human person, and this body and person negate and conceal the light of this G‑dly soul . . . yet nevertheless, the soul purifies and elevates the body, the person and even her share of the world.

And what is the reason behind this purpose?

There is none.

It transcends reason; it is the place from which all reason is born.

And so it is unbounded and all-consuming.
For it is a desire of the Essence.

—from the Rebbe’s discussions of his father-in-law’s last discourse.