I read the entire Dune series about 10 years ago in my late teens. At first I didn't know exactly why I liked them, but as I grow and learn, it is easier to articulate why they fascinated me.
The Bene Gesserit are by far my favorite organization in the Dune Universe, followed by the Spacing Guild and the Bene Tleilax
The two aspects of the Bene Gesserit that I find most interesting are their beliefs on free will & destiny, predicting the future, and their breeding programs.
I am Fatalist, I believe everything has been predestined and there is only one inevitable future. If this is true, the future should be predictable, and if the future is predictable you can prove it by predicting it. I love Fatalism because it is the only religious belief that can theoretically be proven (I use the word proven lightly). If we have free will, the future is not preexisting, and so it should not be predictable. However, if the future is not predictable, you can't prove it by not predicting it, because it is always possible you simply did not have enough information. The whole point of the Bene Gesserit Kwisatz Haderach breeding program is to create a Messiah with nearly perfect powers of prescience. Fatalism and Prescience is where Philosophy, Science, and Religion meet.
After reading about the BG breeding program, and their desire to gain the objective power of predicting the future, I became interested in the concept of eugenics. My search eventually brought me to my mentor, Margaret Sanger, the founder of Planned Parenthood. You can read her books and listen to her interviews on my website
www.progenica.org. Her book, The Pivot of Civilization changed by life. Above everything else, she was an implementer. She had the vision to materialize her program for the "New Race". I also have read her Autobiography, and plan on reader her book, Woman and the New Race this summer.
Anyway, I hope this works out and I get to know all of you
-Progenica