The history of philosophy would not have needed to wait for Heidegger if Hegel had taught us that the transformation from hypokeimenon to subiectum introduced by Descartes is due to the transformation from truth to certainty, which he introduces too. So, taking for subject this certainty, which makes the certainty of subject, we aim to understand that before the truth of man was distorted, the truth itself – the ontological and antepredicative truth, i.e. aletheia – was with him.