We have discussed the phenomenological horizons of the Platonic sophrosyne together with the original science of life of Heidegger, in order to clarify the origin of all phenomena. To make such an attempt, we have made an analysis of the ontological dimension of Dasein, in its behavior-in-the-world. Finally, it has become clear how the only way to access this pre-theoretical science is using the phenomenology, in a radicalization of the principle of all principles.
