In "Being and Time", Heidegger resumes anew the question of the meaning of being, that was asked for the first time by Plato and Aristotle. These philosophers of the first hour of Being considered as the generality of things, and also a supreme generality, so indefinable. Nowadays, we are used to miss this issue. Indeed, the word is being used without that everyone can clearly define it. The first section of "Being and Time" aims to clarify what it means to be. First, Heidegger gives a negative definition: Being is not a being. But all the research (scientific) always take the theme being. For example the moving bodies in physics, men in anthropology, philology words, etc ... and never reach the question of Being. Only the philosophy inquires of this research. What is the contribution of Heidegger against its predecessors? If we consider the work of Descartes, we are disappointed with his phrase "cogito ergo sum" which does not describe being (sum) but rather subjectivity (cogito). It can be as disappointed medieval theology, even though we recognize the advances in terms of metaphysics, the fact remains that the era of philosophers explain Being in a relationship between God (ens infintum) with human beings (ens creatum). With "Being and Time", Heidegger attempts to access being starting from what we are best known, that is to say man, or "Dasein". From the start of his questioning, it is therefore based on it. Moreover, it takes the phenomenological method of Husserl of accessing the 'being-there-before "by intentionality (for details read" Ontology, Hermeneutics of factivity "). The result is that "Being and Time" accompanies man in his search for himself and authenticity, relating to the world around him, the world he has to use at best. There are more Being that hover above the man as the ultimate generality of created things. The Being with Heidegger remains the Being of man, he finally define as being in the world and related to the finite time of a lifetime ...
