One of the (many, many, many) things I learned in Provincetown was that I really need to go back to Wallace Stevens. I mean, I've read him -- of course I've read him; I did take poetry classes as an undergrad, after all! -- but I haven't read that much of him since I got my head screwed on (closer to) straight about poetry & about who I am as a poet. I've just ordered his book of essays, The Necessary Angel, and his Collected Poems. Stevens and Stein were the two most-referred-to poets in our workshop, I believe (no, I wasn't keeping track); I don't feel particularly drawn to go back to Stein right at this moment, but I suspect I should spend some real time with Stevens.
Are there poets (or other writers) you read early on in your writing life and then went back to much later? Who were they and what was that experience like? Or are there poets/writers you want to go back to now?