Being and Time

“The real movement of the sciences takes place when their basic concepts undergo a more or less radical revision which is transparent to itself. The level which a science has reached is determined by how far it is capable of a crisis in its basic concepts. In such immanent crises the very relationship between positively investigative inquiry and those things themselves that are under interrogation comes to a point where it begins to totter. (…) In biology there is an awakening tendency to inquire beyond the definitions which mechanisms and vitalism have given for life and organism, and to define anew the kind of Being which belongs to the living as such.”

Martin Heidegger