our existence so defined is posed in the question of the nothing, then it must have become questionable through this question.
Scientific existence possesses its simplicity and aptness in that it relates to beings themselves in a distinctive way and only to them. Science would like to dismiss the nothing with a lordly wave of the hand. But in our inquiry concerning the nothing it has by now become manifest that scientific existence is possible only if in advance it holds itself out into the nothing. It understands itself for what it is only when it does not give up the nothing. The presumed soberness of mind and superiority of science become laughable when it does not take the nothing seriously. Only because the nothing is manifest can science make beings themselves objects of investigation. Only if science exists on the basis of metaphysics can it advance further in its essential task, which is not to amass and classify bits of knowledge but to disclose in ever-renewed fashion the entire region of truth in nature and history.
Only because the nothing is manifest in the ground of Dasein can the total strangeness of beings overwhelm us. Only when the strangeness of beings oppresses us does it arouse and evoke wonder. Only on the ground of wonder—the revelation of the nothing—does the "why?" loom before us. Only because the "why" is possible as such can we in a definite way inquire into grounds, and ground them. Only because we can inquire and ground is the destiny of our existence placed in the hands of the researcher.
The question of the nothing puts us, the questioners, in question. It is a metaphysical question.
Human existence can relate to beings only if it holds itself out into the nothing. Going beyond beings occurs in the essence of Dasein. But this going beyond is metaphysics itself. This implies that metaphysics belongs to the "nature of man." It is neither a division of academic philosophy nor a field of arbitrary notions. Metaphysics is the basic occurrence of Dasein. It is Dasein itself. Because the truth of metaphysics dwells in this groundless ground