‘Time and space: do causes occur before their effects?’ considers David Hume's ideas of temporal priority and contiguity for causation. Temporal priority means that causes must precede their effects in time, and contiguity means that causes and effects must be at places next to each other. Temporal priority delivers an asymmetry to causation that neither constant conjunction nor contiguity can. This asymmetric temporal priority seems very important to our notion of causation. It adds something crucial to regularity. It gives it a direction. The concepts of causal chain and Immanuel Kant's instantaneous and simultaneous causation are also explained.