 As Kant also says, “the moral law, and with it practical reason, [have] come in and forced this concept [freedom] upon us” (5:30). In the next section, Kant introduces this idea in notorious terms, as a “fact of reason”: “Consciousness of this fundamental law may be called a fact of reason because one cannot reason it out from antecedent data of reason” (5:31; cf. 5: 6, 42f, 47, 55, 91, 104).