Here is a page where you can download readings of Rudolf Steiner's lectures. Just left click on the "book" and it will download however you tell it to. I just click on the top entry and it downloads them all instead of downloading each chapter individually. There are many "religious" books but also some good ones on Bees and agriculture (mostly for this forum). I suppose if you want to blow your mind, buy some duct tape and wrap your head before listening to some of the other "spiritual" works.
This is what I was thinking at the time I typed this, it could change with better facts.