 Returning to Church’s “opposition to the claim of superior reality for physical or spatio-temporal entities”, his reason was that spatio-temporal entities are, like abstract entities, postulated ontological commitments of theories. For this reason, terminology for spatio-temporal entities does not “belong to the vocabulary in which the observational data are stated;” rather they are theoretical constructs the terminology for which “belongs to a theoretical language” (1951b, fn. Added 1971 [BE: 287]; cf. 1975 [BE: 983–4].)