It's a peculiar thing, I suppose, but I just finished re-watching an episode of The Adventures of Sherlock Holmes with Jeremy Brett. The episode was S04E04, The Red Circle.
In it, a couple very much in love, finally escape the horrible influence of an evil Italian group, the red circle. Holmes exercises compassion for the couple, helping them constantly, with modest emotional response.
At the end, he attends an opera, in which a woman of excellent voice sings a tragic melody. Holmes is crying his eyes out. What is this but the evident demonstration of something I've long been well aware of. There are matters in life that touch our heart extremely, such as certain musical strains. They touch the emotions beyond holding them in, while a tragic event may not cause such a public display.
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