By believing passionately in something which still does not exist, we create it. The nonexistent is whatever we have not sufficiently desired.
Source, in full
Attributed to Kafka in Ambiguous Spaces (2008) by NaJa & deOstos (Nannette Jackowski and Ricardo de Ostos), p. 7, and a couple other publications since, this is actually from Report to Greco (1965) by Nikos Kazantzakis, p. 434