Concept [Begriff] is here originally "epitome" ["Inbegriff"], and this first and always is related to an accompanying comprehensive grasp [Zusammengriff] of the turning in the event.
At first the epitomizing can be indicated by the relation each concept of being—as a concept, i.e., in its truth—has to Da -sein and thereby to the steadfastness of the historical human being. Inasmuch, however, as Da-sein first grounds itself as belonging to the call in the turning of the event, what is most intimate to the epitome [das Innigste des Inbegriffs] lies in the grasping of the turning itself, in that knowledge which, by withstanding the plight of the abandonment by being, stands in the preparedness for the call, i.e., in that knowledge which speaks by first keeping silent out of the steadfastness which withstands in Da-sein
The epitome [In-begriff] is here never the encompassing [Ein-begreifen] in the sense of the inclusiveness of a genus; instead, it refers to the knowledge that derives from being steadfast in and that takes the intimacy of the turning and raises it into the clearing-concealment
28. The immeasurableness of inceptual thinking as finite thinking
This thinking and its order (the one unfolded from it) lie outside the question of whether a system belongs to them or not. A "system" is possible only as the result of the prevailing of mathematical thought (taking "mathematical" in the broad sense) (cf. w. s. 35-613 ). A thinking that stands outside of that domain and of its corresponding determination of truth as certainty is therefore essentially systemless, un-systematic. Yet it is not consequently arbitrary and confused. "Un-systematic" means "confused" and "disordered" only if system is the measuring rod
Inceptual thinking in the other beginning has a different sort of rigor: the freedom of the joining of its junctures. Here one thing is joined to the other out of the sovereignty of the questioning way of belonging to the call.
The rigorousness of restraint is other than the one of the "exactitude" of a loose, indifferent "reasoning" which belongs equally to everyone and whose results are compelling within the sphere of its own claims to certainty. Such results are compelling, however, only because the claim to truth is content with the correctness that comes from deduction and from insertion into a regulated and calculable order. This contentment is the reason the results are compelling.
13. Lecture course, Die Frage nach dem Ding: Zu Kants Lehre von den transzendentalen Grundsiitzen, winter semester 1935-36 (GA41).