Spoken words give a look into how the characters acts. You can hear the feelings of multiple characters. Internal thoughts give you direct feelings of one character; the narrator:)
In Active Voice : I wear Rod Flanders's lucky socks to every World Series game.
In Passive Voice : Rod Flanders's lucky socks are worn by me to every World Series game.
Hope this helped, if not, I'm sorry, but please tell me if how did it help/not help so I can improve :)
The windows getting smaller.