Martin Heidegger
In it, and later works, Heidegger maintained that our way of questioning defines our nature. But philosophy, western civilization's chief way of questioning, has lost its way. Finding ourselves "always already" fallen in a world of presuppositions, we lose touch with what being was before its truth became "muddled".  As a solution to this condition, Heidegger advocated a return to practical life in the world, allowing it to reveal, or "unconceal" itself.