  The word ‘true’, like other words from our everyday language, is certainly not unambiguous. […] We should reconcile ourselves with the fact that we are confronted, not with one concept, but with several different concepts which are denoted by one word; we should try to make these concepts as clear as possible (by means of definition, or of an axiomatic procedure, or in some other way); to avoid further confusion we should agree to use different terms for different concepts […]. (1944: 342, 355)