Therefore thesis A is wrong, because we can think everything we want, even though it may not be expressible in language. A good example is the experience of the mystics. Although they have an absolutely clear experience and knowledge in their mind, the language is inadequate and too restricted to become a vessel of expression of their most intimate and comprehensive experience or thinking. Ideas are much more complex than the simple components of a language. Although our vocabulary expands continuously, the single words are linked to a precise meaning or several different but yet clear meanings.
Poets try to exploit the farthest edges of our language and to express what seems inexpressible.
This kind of language is open to a vast degree of interpretation and could hardly be used to communicate in everyday life. It is an artistic expression of inner moments of personal experience. It is possible, through the intimations given in poetic language, to transcend the narrow boundaries of language and to reach the original experience or idea, the poet or philosopher or mystic tried to express through the available means of a language. Ideas are the private good of everyone, but language is a public good, that must be available to everyone, otherwise language would be useless. As the primary good of language lies in communication, it must obviously be limited to a certain range of concepts that are clearly defined by tradition and by a tacit contract amongst social beings.