common > look at the signs of acher and R Meir that really one shouldn’t learn Torah from apikorsim
due to my sins, I could not see to which post this relates, but this is an interesting topics in itself. Rambam seemingly ignores Gemora’s permission for “gedolim” to learn from “acherim”. Some (Rav Shach?) explain that he felt that in his times, there were no gedolim any more (sic!), others – that he is writing general advice or talking about public teaching. This is interesting in light of Rambam obviously learning (maybe not torah but Chochma only) from “Acherim”, at least Muslim and Greek ones.
Clearly, R Meir’s situation is pretty exceptional. I do not see this mentioned, but he apparently started ldearning from Acher before Acher went OTD. So, there is an issue of attachment and all Torah that he already learned.
R Soloveichik has a talk in 1991 about Acher and how he is a complicated personality who misunderstood himself
repaired