"IS IT OK TO HAVE ENCYCLOPEDIAS IN YOUR HOME?
It’s a question of limudei chol (secular education).
In Frankurt-am-Main they taught limudei chol in the school of the frum Jews. A man who went there told me once that he learned more Yiras Shamayim (fear of Heaven) from his science teacher there than he learned from his rebbe, because...the science teacher utilized all the lessons to talk about Yiras Shamayim. It’s possible for a teacher to inject now and then certain thoughts in the minds of students that will give them more benefit than what they heard in the mesivta where the rebbe was teaching Gemara and Halacha (Jewish law).
If you’re learned already—you know Mussar, you learn Halacha —and you want an encyclopedia in order to use it to help other people become frum using the information that you might pick up, go ahead and do it. Otherwise forget about it, because you’re not capable of dealing with the Apikorsus (heresy) in these books.
I personally think limudei chol are a good thing if they’re done in a kosher way, because limudei chol leads you to Yiras Hashem if it’s done right. If you’re capable of distinguishing, then it’s alright, but most people shouldn’t bother bringing any other books in their houses, because they’re not capable. Children will read them and they’ll make a wrong impression.
A man once brought me some books. I put them in my bathroom and I keep them there. I get benefit out of them, but he wouldn’t get any benefit from them. (#E-083, Learning to Live Successfully)"