The Rebbe taught:
As pnimiyus HaTorah [the “inner dimension” of Torah] is revealed more and more, the connection between the nigleh [“revealed”] and pnimiyus dimensions of Torah becomes more and more apparent, and the opposition of the opponents to Chassidus steadily diminishes.Why is there a correlation between revealing the connection between nigleh and pnimiyus HaTorah and diminishing the opposition to Chassidus?Toras Menachem 5712, Vol. 5, p. 144.
Perhaps this can be explained as follows. although they may admit on some level that it is a part of Torah, those who oppose the study of Chassidus regard it, whether consciously or subconsciously, as separate and distant from the “traditional” Torah that they know, which they view as “normative”—the nigleh dimension of Torah.
However, when they are shown that the pnimiyus is in fact the pnimiyus of the nigleh that they already know and value,