"The abstraction made by science is thus twofold. First, it is abstraction that defines the scientific world as such. Sensible qualities and the affective predicates that belong to them a priori are put out of play from the being of nature so that they only retain the forms capable of giving them an ideal determination. This nonconsideration of the subjective features of every possible world is indispensable from a methodological point of view, inasmuch as it allows for the establishment of procedures such as quantitative measurement that permit types of knowledge to be obtained that otherwise would be inaccessible. But, the infinite development of this ideal knowledge can only be pursued legitimately inasmuch as it remains clearly conscious of the limits of its field of investigation, limits that it has drawn itself. It cannot escape the fact that the setting aside of the sensible and affective properties of the world presupposes the setting aside of life itself, that is to say, of what makes up the humanity of the human being. That is the second abstraction made by science in the current sense: the abstraction of Life and of what alone truly matters."