The first one from JS Mill resonates with me and JWism. Especially this line
”Nor is it enough that he should hear the opinions of adversaries from his own teachers”
That is exactly what they do. Books from WT refute evolution, discuss other religions, tell them suggestions for teaching Non Christians they meet but it is all selected and filtered through the WT teachings.
They are strictly told never to accept literature from opposing groups. They believe they know all about it from their own Society. They are wrong!