Answer : Motivation affects the theme of a story.
It is very important to know the motivations of the characters in specific literature because the character's motivations are the reason why the character is acting the way he/she is acting in the literature. The motivation of the character in the literature when revealed will create a different theme because hidden reasons and background stories of the characters will be examined. The readers' view may also get affected upon the revelation of the characters' motivation. The motivation of the character's action in the literature will show a different side of the literature.