摘要:This paper aimed to reflect about the issues of identity amidst diversity and plurality that is the subject of study in the psychology’s space. The question is usually: How to get to the unit you wish to Psychology on the diversity of its object, i.e. the existence? To accompany the proposed issue, the problem of identity and difference is addressed first to how they were thought from the Pre-Socratic philosophy to the present. In Heidegger’s work was studied his text Identity and Difference; in Kierkegaard’s work, his Repetition. With these notions sought to defend the identities, which are essential in psychology, without neglecting the richness of plurality and complexity that is characteristic of its subject, that is, human existence.