Being and Time by Martin Heidegger

"Not only that. On the foundation of the Greek point of departure for the interpretation of Being a dogmatic attitude has taken shape which not only declares the question of the meaning of Being to be superfluous but sanctions its neglect. It is said that "Being" is the most universal and the emptiest concept. As such it resists every attempt at definition. Nor does this most universal and thus undefinable concept need any definition. Everybody uses it constantly and also already understands what they mean by it. Thus what made ancient philosophizing uneasy and kept it so by virtue of its obscurity has become obvious, clear as day; and this to the point that whoever pursues it is accused of an error of method."