"The life that we are speaking about cannot be confused with the object of scientific knowledge, an object for which knowledge would be reserved to those who are in possession of it and who have had to acquire it. Instead, it is something that everyone knows, as part of what we are. But how can "everyone" -- that is, each individual as a living being -- know what life is, except in the respect that life knows itself and that this original knowledge of the self constitutes its own essence? Life feels and experiences itself in such a way that there is nothing in it that would not be experienced or felt. This is because the fact of feeling oneself is really what makes one alive. Everything that has this marvelous property of feeling itself is alive, whereas everything that happens to lack it is dead. The rock, for example, does not experience itself and so it is said to be a "thing". The earth, the sea, the stars are things. Plants, trees, and vegetation are also things, unless one can detect in them a sensibility in the transcendental sense, that is to say, a capacity of experiencing itself and feeling itself which would make them living beings. This is life not in the biological sense but in the true sense -- the absolute phenomenological life whose essence consists in the very fact of sensing or experiencing oneself and nothing else -- of what we will call subjectivity."