Those Greek particles

There are some small words in Greek that are very helpful guides in interpreting the phrases or clauses that they introduce. Traditionally, they have been read as if they have a fixed lexical meaning, and this has led to some difficult translations both logically and theologically, in which a theological agenda has been pinned on a fixed lexical meaning that the language cannot sustain. Relevance theory deals with such words as giving procedural instructions to a reader or hearer to process the following phrase, clause or sentence in a certain way. In other words, it constrains the range of possible meanings and gives clues to the reader about the communicative intention of the author. The assumption is that these are present in the text to make something ostensive.—Margaret Sim, A Relevant Way to Read, 71