Language and word – these notions were among of the most important representations in Heidegger’s thought. Heidegger wanted to find the meanings of these notions and thus join a great tradition, but he also wanted to delve into first philosophy to retrieve lost notions. This investigation focused on language as the differentiating human activity. But he also realized that language was a mystery from beyond anything human, which, nevertheless, needed humans to express itself. In short, I want to explain what is the metaphysical consciousness in this transformation. I argue that it is the examination of fundamental words that will reveal the condition of being human and of being in general.