The "subjunctive mood" refers to a way of expressing uncertainty, doubt, or a hypothetical situation in a sentence. It often suggests that something is hoped for, desired, or imagined, rather than stating a fact. Full definition
Rilke's heather might have eluded time, but it is also the material reminder of the irredeemable moments in the past, moments cast in a forever unresolved subjunctive mood that unsettle the present, making it seem incomplete. (brooklynrail.org)
Symbols point to the future for their reality; hence they are relative, provisional and always couched in the subjunctive mood because there is the dimension of futurity and possibility in them. (religion-online.org)
Observe also how heavily Stendahl leans on the passive voice and the subjunctive mood: was found, could be found, would conceive of, would exercise. (religion-online.org)