Read it through once

I, that have haunted the dim San Spirito, (Or was it rather the Ognissanti?) Patient on altar-step planting a weary toe! Nay, I shall have it yet! Detur amanti! My Koh-i-noor--or (if that’s a platitude) Jewel of Giamschid, the Persian Sofi’s eye; So, in anticipative gratitude, What if I take up my hope and prophesy?