One could intensify this as, most likely, we always only just believe that we know something. In any case, it is very unclear what ‘knowledge’ means and comprises because projections and delusions always get interfused with knowledge, whereby knowledge represents only one dimension of the desperate search for certainty and, hence, for security. If anything, the smartest statement in this context will certainly be: “I know that I know nothing” (attributed to Socrates).
Fantasy, however, opens up all kinds of possibility, it is boundless and even manages to process confusion and mistakes.