CAUSALITY

[A228/B280] Like, e.g., the categories of substance and community, the category of causality is a condition of understanding for the "a priori synthetic" unity of the manifold of intuition. The causal maxim is an "a priori law of nature" since, in the Second Analogy, Kant argues that a condition for the possibility of making any temporal judgment (and thus of having any possible experience) is that we represent every event as caused. Kant also believes that causality is not derivable empirically.

See Causality method and "Causality principle"