In the book of Rav Nahman of Uman he deals with the issue of Torah scholars that are themselves demons in the LeM vol I ch 12. Later in vol I chapter 28 he deals with a slightly different issue of people that hear Torah lessons from Torah scholars who themselves receive their Torah lessons from the Dark Side.

 

The basic idea there is that there are the "alef"s in the higher worlds. But often what some higher spiritual essence comes down into this world , it gets physicalized  in such a way that the dark forces have a hold on it. So when Torah scholars who receive their lessons from teh demons, when they see someone who is serving God with simplicity and with no "wisdoms", they try to stop them.

This I can imagine was the case in the days of Rav Nahman himself who had a lot of enemies and certainly his students. And this Torah lesson was probably said in relation to that fact. But I think it applies all the more so nowadays. When there is someone who just wants to sit and learn Torah for its own sake and not work and just trust in God to provide his needs, often the very enemies of that person are Tora scholars who are demons.