He goes on to contemplate his grief if he were never given the chance to capture the beauty of, "Huge cloudy symbols of a high romance," and describes the process of their description in his poetry as tracing, "Their shadows with the magic hand of chance," This seems to show a recognition that his poetry, and the beauty that inspires it, is something magical and other-worldly, and this realisation adds to his distress, were he to die and never fully reach his poetic potential.
In this way, Keats' ideas are most certainly abstract, and, in my opinion, are expressed clearly and directly in this poem.
Keats says that reading amazing books makes him feel, "Pure serene," This is then precisely captured when his simile compares Chapman's translation of Homer to being, "Like some watcher of the skies when a new planet swims into his ken," The conceit of the poet as an adventurer and traveller in the wonderfully exciting world of literature runs throughout the poem, and helped communicate to me the awestruck feelings of the poet when reading this version of Homer.
Personally, in this poem, I did not feel as though Keats' style was immediately clear, but after a little thought, his point is very direct and intelligible.
The key, for me, was to understand that Keats writes in figurative language.
The, "Realms of gold," and the, "Goodly states and kingdoms," referred to in the octet are metaphors for great art.
At first, I was confused by this idea, as I was by his celebration of art.
However, when I read, "On First Looking into Chapman's Homer," these ideas became clear to me, and the theme became much less difficult to understand, and much more interesting.
The knight is, "Lulled," to sleep, bewitched, and dreams of kings, princes and warriors who are, "Pale," have, "Starved lips," their mouths, "With horrid warning gaped wide," The reason for the beautiful woman being described as, "Sans Merci," is now apparent and with it, the poem becomes clear.
Keats' ability to express his abstract ideas is impressive, conveys them through a style that is clear and direct after thought.