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Pure reason (n.) that ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠leaves the objects of experience behind finds no object at all, only empty space for intuition, and must steer by feel.

Pure reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠built like an organism: every part is there for the sake of all the rest, and all the rest for its sake.

Pure reason (n.) as ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a merely intelligible faculty is not subject to time: its causality does not arise or start working at a certain moment.

Pure reason (n.) own ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠questions must absolutely be answerable, since they come not from the nature of things but from the nature of reason itself — so the excuse of the limits of cognition is not permitted here.

Pure reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠so organic that even the slightest error must betray itself in use, and altering its smallest part brings contradictions not just into the system but into universal human reason.

Pure reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠knowledge that does not come through our senses, but is independent of all sense experience; knowledge belonging to us by the inherent nature and structure of the mind.

Pure reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠in fact concerned with nothing but itself: what is given to it is not objects to be unified but the understanding's cognitions to be unified into a system.

Pure reason (n.) has ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠a need that is not a hypothetical itch of speculation but a legal need: to assume something without which what one ought irremissibly to aim at could not be done.