From the detailed reading of Jacques Lacan s seminar 3 we intend to demonstrate how in the course of the referred seminar, Lacan stablishes clinical treatment guidelines of the psychosis founded by his conception of the unconscious as language structured by the Freudian subject as a product of language effects. Despite being a well explored clinical guideline, a few of its orientations are still to be developed specially those concerning the analyst s method of intervention, considering as a standard to take literally what the analysand has to say, in other words, as Lacan implies, from elements of the materiality of the signifier in opposition to the classic approach by the meaning and signification of the analysands discourse. Therefore, we follow the course trailed by Lacan in a way of stablishing a general logic of the language structure, and next, follow a specific logic of the psychosis that differs from the neurosis.