Since this is to be a matter of spiritual functions which exercise their accomplishments in all experiencing and thinking, indeed in each and every preoccupation of the human world life, functions through which the world of experience, as the constant horizon of existing things, values, practical plans, works, etc., has meaning and validity for us, it would certainly be understandable that all objective sciences would lack precisely the knowledge of what is most fundamental, namely, the knowledge of what could procure meaning and validity for the theoretical constructs of objective knowledge and which thus first gives them the dignity of a knowledge which is ultimately grounded.