Kant's gesammelte Schriften. Band V. Kritik der praktischen Vernunft.

This work opens by asking a surprisingly simple question: what does it mean for reason to be truly practical? Kant argues that pure practical reason is distinct from its speculative counterpart, and he sets out to test whether it can stand on its own without overreaching into unfounded claims. In the first section he lays out the idea that freedom is not merely a hopeful notion but a necessary condition for moral law to have any force. The tone is methodical, inviting listeners to follow a step‑by‑step examination of how duty and autonomy intertwine.

Building on that foundation, the author connects freedom to the broader ideas of God and immortality, showing how these concepts gain legitimacy only when tied to moral necessity. By treating freedom as an apodictic principle, the argument gives the moral law an objective reality that does not depend on empirical proof. Listeners will appreciate the careful balance between rigorous logic and the timeless relevance of asking how we ought to act, making the early pages a compelling entry point into one of philosophy’s most influential critiques.