For the first principle is a general principle that must be true for all propositions. Now, let us consider the meaning and usefulness of these principles. In all of literature and discussion, we are accustomed to using symbols to represent things that we encounter around us. It is quite an abstract symbol, for it does not even refer to any specific kind of object. But it only refers to the fact that there are two of them.
Written words are also symbols that refer to the meaning of spoken words.
And various words also symbolize different objects and actions. As long as your symbols are clearly defined, there should be no confusion. Scientists use a well developed language of symbols to describe the various kinds of physical phenomena. They use the language of mathematics. And even the most complicated propositions and theories can be expressed using the language of mathematics.