Yeah, I used to be very adverse to such things, I still am, in part because I know just how impossible it is to read something you dont believe and get an understanding of the material at the same time. It requires suspension of disbelief. anyone can have an open mind sometimes, but no one can do that all the time. For some concrete examples I would implore you to read excerpts from 'Ageless Body, Timeless Mind' by deepak chopra. To put it mildly, I know I have my limits.
Required reading material is usually more mundane than some of the stuff out there. But that could also mean that it's not daring enough to require reading. So my philosophy is that you should support people in choosing their adversity, never mandating.