We manipulate emotional conditions in order to induce certain ways of responding.  One example of this can be seen in theatre. Actors often elicit tears from painful memories if it is necessary for the character they are playing. This idea is similar to the notion if we read a letter, book, listen to music, watch a movie, in order to get us in the "mood" so we can be in the proper state of mind for a certain event or function.  Additionally, treating an activity as "work" or "fun" can have an effect on the difficulty of self-control. 
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