This work attempts to rise above polemic and bias and adopt the closest position to the reality, from an empirical and political point of view, of the German world of the first half of the 20th Century, as it was approached by Heidegger through his work and his life. So, should we join certain among his disciples by avoiding embarrassing questions, and rid his writings of any such questions in order to focus on a purely philosophical quest? The life of man is made up of choices which involve a whole existence. We do not live in a disembodied world, one that is purely intellectual, but rather a world in which the forces with which we intermingle clash, which, no matter what our interest may be, we must take into consideration and with which we must be composed. Lastly, the reductive danger of any historically based interpretation of philosophy must be emphasised. If any system is the reflection of the world in which the philosopher lives, the problem facing philosophy is that of emerging from the factual in order to test the dimension of temporality which is a long-term process. Any philosophical approach lies between these two poles: the embodiment of its thought in history and the desire to emerge from this, or the emergence from the cyclical in order to pursue the essential.