The aim of this contribution is to show, in a basic outline, in what ways and why Heidegger, by thinking from the point of view of the history of Being (seinsgeschichtlich), finds the motifs of the certainty of salvation and faith in medieval Christianity to be the key moments that have determined the fundamental metaphysical positions of the modern period, which could fully develop its nature, thus acquiring its definitive shape, only in the twentieth century as the latest time of the modern period (neueste Neuzeit).