We discuss singular words that are spoken in the therapeutic encounter, that shine above the skies of therapeutic change. These are words that hold a unique representation, unlike other words, of a not yet fully verbalized self-state. They are a crack in the wall of dissociation between self-states. It is far from being a new idea that language sets motion in the inner psychic world. However, our paper aims to anchor this idea¹ of the effect of a singular word in philosophic-linguistic theory. We provide clinical vignettes that show how these words can be detected in the shared experience.