"The Critique of Pure Reason" by Immanuel Kant is a philosophical work published in 1781. Kant investigates the limits and scope of metaphysics, asking how we can know anything before experiencing it. He challenges both rationalist and empiricist traditions, introducing revolutionary ideas about space, time, and knowledge. The central question driving the work is: "How are synthetic a priori judgments possible?" Kant argues this matter is crucial to the survival of human reason itself.