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Quotation from Critique of Practical Reason by Immanuel Kant
“Inasmuch as the reality of the concept of freedom is proved by an apodeictic law of practical reason, it is the keystone of the whole system of pure reason, even the speculative”
Critique of Practical Reason, Preface, trans. Thomas Kingsmill Abbott (1889)
Kant explains why freedom, made certain by the moral law, holds together the ideas of God and immortality.
Citation: "Inasmuch as the reality of the concept of freedom is proved by an apodeictic law of practical reason, it is the keystone of the whole system of pure reason, even the speculative" — Immanuel Kant, Critique of Practical Reason, Preface, trans. Thomas Kingsmill Abbott (1889). (id kant-critique-of-practical-reason-q1)
Portrait: Immanuel Kant - Gemaelde 2, Becker, Public domain.
