I just found "Raja Yoga" by Swami Vivekananda in the depths of my comp. I think I'm gonna try to start with this, only a few pages in and it seems like an amazing book already

"Each soul is potentially divine. The goal is to manifest this divinity within, by controlling nature, external and internal. Do this either by work, or worship, or psychic control, or philosophy-by one, or more, or all of these-and be free, This is the whole of religion. Doctrines, or dogmas, or rituals, or books, or temples, or forms, are but secondary details."