The author 'divides' literature into three categories. [=the author says that there are three categories of literature]
The teacher 'divided' the class (up) into four groups. = The teacher 'divided' (up) the class 'into' four groups.
Two 'divides evenly into' eight. [=eight can be divided into two an exact number of times with nothing left over]
(..) Nobody studies it for fun. It's not a, a necessity, especially for someone like you. - Someone like me? - Yeah. Someone who divides their time fairly evenly between batting cages and bars. I mean, I would hardly say it was a necessity. Oh. You know, there are very smart people (..)1997 Good Will Hunting