Who was more likely to accept the trustworthiness of instinctive feelings a romantic poet or an enlightened philosopher

Romantic Poet

Explanation:

I'd go with Romantic Poet because someone could be "in the moment." Meaning they don't care, and they're just like "oh yes I trust you now because you took the time to write this poem for me!"

An enlightened philosopher stands by their feelings and their feelings only, at least that's my thought in it.

That's my initial thought.

Romantic poet is yoir answer