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I always liked what Charles Darwin wrote to J. D. Hooker in 1853:
After describing a set of forms, as distinct species, tearing up my M.S., & making them one species; tearing that up & making them separate, & then making them one again (which has happened to me) I have gnashed my teeth, cursed species, & asked what sin I had committed to be so punished […]
It describes perfectly the feelings of a biologist while doing taxonomy work.
Oh shit, is real: https://doi.org/10.1016/j.devcel.2022.01.005
🤣