Thinking begins only when we have come to know that reason, glorified for centuries, is the stiff-necked adversary of thought.

"one who runs along with" but the equivalent meaning in English is closer to "bandwagon effect" or "herd instinct" standing for the notion that people often do and believe things merely because many other people do and believe the same things) of National Socialism and no punitive measures against him were proposed. Within philosophy it played a crucial role in the development of existentialism hermeneutics deconstructionism postmodernism and continental philosophy in general. One crucial source of this insight was Heidegger's reading of Franz Brentano's treatise on Aristotle's manifold uses of the word "being" a work which provoked Heidegger to ask what kind of unity underlies this multiplicity of uses.

As a solution to this condition Heidegger advocated a return to the practical being in the world allowing it to reveal or "unconceal" itself as concealment. Finding ourselves "always already" fallen in a world of presuppositions we lose touch with what being was before its truth became "muddled". Writing extensively on Nietzsche in his later career and offering a "phenomenological critique of Kant" in his Kant and the Problem of Metaphysics Heidegger is known for his post-Kantian philosophy.