Russell and Causality

"There seems no reason to regard causation as a priori, though this question is not simple. Given certain very general assumptions as to the structure of space-time, there are bound to be what we have called causal laws. These general assumptions must really replace causality as our basic principles. But general as they are, they cannot be taken as a priori; they are the generalization and abstract epitome of the fact that there are causal laws, and this must remain merely an emperical fact, which is rendered probable, though not certain, by inductive argument."

Bertand Russell (1927)

(I've no idea what Lord Russell is saying, but I enjoyed typing it.)