What is the difference between the wisdom of the nations that you are allowed to accept and the Torah of the nations that you are not allowed to accept?
How can we understand how Torah arrives to our world. For example, if a non-Jew knows how to read Hebrew and explains a verse and Rashi from the Torah, is it similar to him explaining a law of physics that he studied in university, the answer is no. The reason being, that a gentile is not connect to the inner and intrinsic part of the Torah, whereas a member of Israel, Torah is related intrinsically to his soul.