A proposition must use old expressions to communicate a new sense meaning that a proposition communicates a situation to the people meaning that it has to be connected to the said situation that it is communicating. The communication that it makes and the impression that it creates to the people in the society is a logical picture that gives the people an impression of what a situation looks like and the effect that it may have on the lives of the people in the society.
A proposition is used in communicating sense to the people in the society. A proposition is a picture, and the fact that a proposition is taken to be a picture means that once one hears and understands a given proposition, he or she will then create a vivid picture that in the mind of the person that understands the proposition. It is, therefore, easier to understand a question by creating a vivid picture in mind about what the picture is saying, and in so doing, one can read a sentence and understand what it is communicating. One may also understand the content of a sentence it is read to him or her. When a sentence is complicated, the reader may have a hard time when it comes to creating an image in mind with regards to that particular sentence, which is a situation that makes it hard to understand some sentences.