To write fiction, you must develop your capacity be empathetic. In fact, you could argue that empathy is synonymous with story.
Don’t believe me? Plug the word story for empathy into this list of definitions for empathy that I found on Wikipedia:
[Empathy] is what happens to us when we leave our own bodies…and find ourselves either momentarily or for a longer period of time in the mind of the other. We observe reality through her eyes, feel her emotions, share in her pain. –Khen Lampert