By believing passionately in something that still does not exist, we create it. The nonexistent is whatever we have not sufficiently desired.

Source: Attributed to Kafka in Ambiguous Spaces (2008) by NaJa & deOstos (Nannette Jackowski and Ricardo de Ostos), page: 7, and a couple other publications since, this is actually from Report to Greco (1965) by Nikos Kazantzakis, page: 434

Since we cannot change reality, let us change the eyes which see reality.

Source: Nikos Kazantzakis, Report to Greco (1965), “The Son”, Chapter: 4.