Likutei Sichos – Vol 26 p 26 ff The More’ Nivuchim was given with all kinds of constraints, and it is in fact available and learned by all. Why? Page 33-4.

Likutei Sichos – Vol 26 p 26 ff The Alter Rebbe’s Shulchan Aruch and the More’ Nivuchim and the Tanya also reveal. The secrets are more revealed and they are also better understood. Page 32-3.