Simplify the following text for a Grade 7 native English-speaking person.
Original: The term is sometimes popularly taken to mean `` knowledge meant only for certain people '' or `` knowledge that must be kept hidden '' , but for most practicing occultists it is simply the study of a deeper spiritual reality that extends beyond pure reason and the physical sciences .
Simplified: The term sometimes means knowledge meant only for certain people or knowledge that must be kept hidden . For most occultists it is the study of a deeper spiritual reality .