While syntax deals with the form and structure of a language, semantics deals with its meaning and truth. When considering the general question of the semantics of a language, one must get clear on the meaning of the terms of that language, and the meaning and truth of sentences comprised of those terms. Terms having meaning apart from other linguistic units were called by the medievals categorematic terms. Terms not possessing meaning on their own (e.g, 'is', 'of') were called syncategorematic terms. In establishing the semantics of a language, one has to specify the meaning of a class of primative terms, and then show how the meaning of those terms contribute to the meaning of sentences in which those terms are ingredient.
In ascribing a semantics to theological sentences, one routinely examines their truth-conditions. The truth-conditions of a statement are those conditions which must obtain if the statement is to be true. For instance, the truth conditions of 'the cat is on the map' are those conditions which must obtain if 'the cat is on the mat' is true. These conditions simply are the state of affairs of there being a cat, a mat, and the relation of the cat being on the mat. Simply put, 'the cat is on the mat' is true if and only if the cat is on the mat.
Now in considering these truth-conditions, the question arises as whether or not one can specify evidence transcending truth-conditions. While it is in principle possible to have a perceptual causal connection to cats sitting on mats such that one can truly know when or if the requisite conditions are fulfilled such that 'the cat is on the mat' is true, this is not so with regard to most theological statements. What causal connection can one have to states of affairs like 'there are three distinct persons united in one divine being or essence'? How could one ever be said to know this is the case? Those who for this reason reject the possibility of evidence transcending truth-conditions are antirealist with respect particular classes of statements. While language like 'there are three distinct persons in one divine being or essence' are perhaps warrantably assertible, they have no truth-conditions, for the condition for the possibility of truth-conditions cannot be met. To accept the possibilty of evidence transcending truth-conditions for a class of statements is to be realist with regard to that class of statements. The question is this: Should Lutherans accept a realist construal for their theological language? Over the last 200 years Lutherans have progressively become less and less sanguine that theological language has truth-conditions, and that is thus can be given a realist construal.
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