In his Logic, Hegel makes a distinction between border (die Schranke) and limit (die Grenze):
In the very fact of determining something as border, one is already beyond it. […darin selbst, das etwas als Schranke bestimmt ist, darüber bereits hinausgegangen ist.]
Conceptualisation of a border always involves us in the further domain beyond; conceiving a border crosses it conceptually.
A limit, on the other hand, is a conceptualisation without passage; in conceiving of a limit we stay only within it and what would be ‘beyond’ it remains unfathomable and unspeakable.
The limit forbids, the border allows. The one cannot be crossed, the other has already been crossed. Limits are external, borders are internal, they border on an outside which lurks within the inside.Dolar 2016
For Hegel reason (die Vernunft) is the very capacity to conceive every limit as a border.
- Dolar, M.E., Friedman, M., & Tomšič, S. (2016). Voice and Topology: The Tiny Lag available at https://www.researchgate.net/publication/309779040_Voice_and_Topology_The_Tiny_Lag_New_Conceptions_of_Geometry_and_Space_in_Freud_and_Lacan or https://www.semanticscholar.org/paper/Voice-and-Topology%3A-The-Tiny-Lag-Dolar-Friedman/6ffedafde45f71b439a2a319b5f502f0ae00a728