answer: the poet, while creating, is divinely inspired. but the poet loses himself in creation and should be feared for that reason.
explanation:
coleridge wrote the poem kubla khan after a dream he had under the influence of opium. in the story, a man called kubla khan arrives at a dome where nature inspires fear and wonder simultaneously - xanadu. ice caves coexist with brightness and sunshine. voices talk of prophetic war while gardens blossom full of incense trees.
in the last stanza of the poem, the speaker's identity seems to melt into khan's. the speaker desires to relive that dream, to build that dome in the air, to feel what he once felt. in his thirst to do so, the poet/speaker is at once divinely inspired and fear inspiring. as we can read below:
i would build that dome in air,
that sunny dome! those caves of ice!
and all who heard should see them there,
and all should cry, beware! beware!
his flashing eyes, his floating hair!
weave a circle round him thrice,
and close your eyes with holy dread
for he on honey-dew hath fed,
and drunk the milk of paradise.
the poet, after having a vision of xanadu - after drinking the milk of paradise and feeding on the honey-dew -, in his pursuit to recreate it, becomes a sort of mythological, supernatural being that should be feared. to protect themselves, others should "weave a circle round him thrice".