Emotions can be good and they can be bad. But one thing's for sure--your book has to provoke them.
Think about it. Your favorite movie, favorite place and yes even your favorite book becomes that favorite because of how you feel watching, reading and being in that place.
And, even action movies/books aren't all adventure. They have to provoke some sort of emotion: maybe fear, excitement or joy. Without emotion your book is dead.
And remember to add a little something from both sides of the coin: good and bad feelings make your story multi-dimensional.
So happy AND sad writing, reading and watching--it's what gives life the spice :)
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