fact of reason, n.Definitions

The Fact of reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the consciousness of the moral law, which cannot be reasoned out from anything prior but thrusts itself upon us on its own.

The Fact of reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠what turns the speculative "can" of freedom into an "is": an actual case proving that certain actions, even merely commanded ones, presuppose a causality not conditioned by sense.

The Fact of reason (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠not an empirical fact but the sole fact of pure reason, by which reason announces itself as originally legislative: thus I will, thus I command.