In the sicha of Shabbos Parshas Shmini, Shabbos Mevorchim of the month of Iyar 5710, the Rebbe said:
“The truth is that it isn’t even possible to ask questions about the Rebbe … as it is well known that the idea of Rebbeim is a preparation for the coming of Moshiach of which it is written, “And the glory of Hashem shall be revealed, and all flesh shall see” — they will see Elokus (Divinity) with fleshly eyes.
In preparation for that time, Atzmus (the “essence” of Hashem) — which is Kol Yachol (omnipotent) and Nimna Hanimnaos (it is impossible to ascribe anything to Him as impossible) — [is revealed to every individual] by so-to-speak enclothing Himself in a physical body, visible to fleshly eyes, that used to answer everyone face to face.
Hence, an answer given by a Rebbe is “The spirit of G-d spoke within me, and His word is on my tongue” — [though] usually spoken in Yiddish, with an odd word of English or Russian, or whatever —
If so, it is impossible to question a concept of Nimna Hanimnaos…
The following words were added by the Rebbe to the sicha while editing it:
ווארעם א רבי’ס אן ענטפער איז דאך “דבר הוי’ דיבר בי ומלתו על לשוני”.
“An answer given by a Rebbe is ‘The spirit of G-d spoke within me, and His word is on my tongue.’” ■