Two related notions; one by Bruno, one by Bakhtin:

Every word is directed toward an answer and cannot escape the profound influence of the answering word that it anticipates. (Mikhail Bakhtin, from The Dialogic Imagination, 1975)

Because our knowledge is ignorance, or because it is neither knowledge of anything there nor the understanding of any truth, or because even if there is some entrance to that truth, the door may not come open except by means of ignorance — which is simultaneously path, gatekeeper, and gate. (Giordano Bruno, from The Cabala of Pegasus, 1584)