[fylox]

I completely agree. One of those books which was in some passages extremely hard (or even painful) to read is "Thou shall prosper" from Daniel Lipman, a (right wing) Rabbi! It changed the way I look at business. Some arguments convinced me, others I still can't accept. But it showed me that axioms which seem counter-intuitive to me can build a very practical world view.

Another book which is rather on the extreme side is Eckart Tolle's "The Power of now!". Again, I sometimes couldn't stand his opinion. For example whenever he quotes Jesus and explains that most people get it wrong but in fact it would be like this or that.

But the book showed me that I was worrying and thinking way too much and that this is at best useless and sometimes even dangerous.

Often books don't even tell you something new. And I think even this is worthwhile as long as the author explains what you already know in a very different way.