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@secularmerlin
A reason may be concrete (A boulder is falling so I have reason to move) or abstract/nonmaterial (I am of the subjective opinion that a story is sad so I have reason to cry) in both cases cause and effect is demonstrably taking place. My point in my last post to you is that it doesn't matter if a reason is concrete or abstract.
What happened is reading the story upped your seratonin levels etc so you felt sad and produced tears.