Since it is a strictly physics-related quote i thought this was the best place to ask. It goes something like:
"There are no particles, only fields", to which X replied "there are no fields, but just operators."
Not trying to open a discussion about it's phenomenology, just looking for sources. I remember reading it on the web: either from a paper or a site, so no help there (yes, i've googled any key word and searched every page).