The focus of this paper is on the vital role that language plays in the development of self. The article centres on understanding the complex nature in which different aspects of self are internalised. This arises when meaning is communicated or co-constructed in one's own primary language in early life and how it links to the use of second language in later life. The paper also delves on the issue of the use of both primary and secondary languages and its impact on the quality of therapy and the therapeutic process from a Cognitive Analytic Perspective. The paper aims to explain this complex matrix of the triadic relationship so that this could be better understood by clinicians and interpreters.