Chasidut к Шмот 3:22

Because of this, we will only accept people who concern themselves with these matters into our association. Those who know that they do not belong to this category are asked to not join, so that they do not lead themselves and us astray, corrupting the other members of pure heart and clean thoughts. Furthermore, we are not comfortable that such a person should even read this pamphlet, as is possibly alluded to in the Midrash (Tanchuma, Balak 25) that Israel merited redemption from Egypt by virtue of their not "revealing their secrets" (the Hebrew word for "secret," "mistorin," connotes something that was previously hidden). They didn't just keep the secret of "Each woman will ask from her neighbor" (for valuables - the Jewish people were told a year before the exodus that they would be doing this, but didn't speak about it to their Egyptian neighbors); rather, they kept hidden all spiritual matters that are to be kept secret, for it is not appropriate that others should see exposed souls when they are purifying themselves. Contemplate this.