Robert Graves? Samuel R. Delany? Marilyn Hacker? Apocryphal?

Question for Quote Investigator: The following witty remark is popular in poetry circles although its accuracy is debated:
All true poetry is about love, death, or the changing of the seasons.
This statement has been attributed to the English poet and historical novelist Robert Graves; however, I have never seen a solid citation; hence, I am skeptical. Would you please explore the provenance of this remark?
Reply from Quote Investigator: QI has been unable to find this precise statement in the writings of Robert Graves. QI hypothesizes that the saying was derived from a thematically similar remark in “The White Goddess: A Historical Grammar of Poetic Myth” which Graves published in 1948 and enlarged in 1952. The key sentence occurred at the end of the following passage. Boldface added to excerpts:1
Originally, the poet was the leader of a totem-society of religious dancers. His verses—versus is a Latin word corresponding to the Greek strophe and means ‘a turning’—were danced around an altar or in a sacred enclosure and each verse started a new turn or movement in the dance.
The word ‘ballad’ has the same origin: it is a dance poem, from the Latin ballare, to dance. All the totem-societies in ancient Europe were under the dominion of the Great Goddess, the Lady of the Wild Things; dances were seasonal and fitted into an annual pattern from which gradually emerges the single grand theme of poetry: the life, death and resurrection of the Spirit of the Year, the Goddess’s son and lover.
The quotation in the form specified by the inquiry was popularized by the science fiction author Samuel R. Delany starting in 1975. Delany believed that the quotation appeared in “The White Goddess”. The best partial match found by QI within “The White Goddess” is the sentence above. Detailed citations for Delany are given further below.
Here are additional selected citations in chronological order.
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