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As the article says, "In ancient literature, emotions were predictable reactions to external actions or events."Ancient Greek tragedy has no more "predictable reactions" than a modern work of fiction would have -- it goes into depth about the ambivalence of a character's feelings for example.
Besides the article also says that people in ancient literature didn't openly talk or display their emotions, except through action (tearing their hair, etc). That's patently wrong even for the Iliad, and doubly so for Odyssey.
The article also bizarrely seems to restrict to literature after the fall of Rome and up to the 15th century or so, as if that constitutes the whole of being "ancient"...
Also, have the author read millennia old Greek, Chinese, etc poetry? They'll find all kinds of inner monologues and discussions of feelings.
My heart is no mere mirror
That cannot comprehend.
Brothers I have, but may not
On brothers e’en depend.
Tush! when I go complaining
’Tis only to offend.
No stone this heart of mine is,
That may be turned and rolled;
No mat this heart of mine is,
To fold or to unfold.
Steadfast and strict my life is;
Nought ’gainst it can be told.
Yet here I sit in sorrow,
Scorned by a rabble crew.
My troubles have been many,
My insults not a few.
Calmly I think—then, starting,
I beat my breast anew.
O moon, why now the brighter?*
O sun, why now dost wane?
My heart wears grief as garments
Inured to soil and stain.
Calmly I think—then, starting,
Would fly—but all in vain.
From "The Odes of Pei", several centuries B.C.