On the subject of Grief (and in general Emotions), a study of the works of the Roman Stoics, Cicero and Seneca (and earlier Epictetus) are a must.

In particular; see Cicero and the Emotions : Tusculan Disputations 3 and 4 by Margaret Graver. - https://press.uchicago.edu/ucp/books/book/chicago/C/bo364132...

A good review here - https://bmcr.brynmawr.edu/2002/2002.09.15/