The problem of objectivation of personality in one's activity is considered in connection to methodologicai scheme "subject - product of activity". The degree of subject's external - internal personal orientation in speech activity product - text - is studied. The latter, after I: A. Zimnyaya, is interpreted as multilevel formation realizing all the psychological content of speech activity and of the subject. Representation of subject's locus of control is studied on five separate levels of text, which 'make it possible to state text objectivation of externality- internality and to define motivation-purpose and sense levels of the text as relevant to speaker's locus of control. As a result new approaches to psychological diagnostics of personality are outlined.