Full Idea
The sensible four-dimensionalist will claim that current temporal parts are caused to exist by previous temporal parts. The laws that govern this process are none other than the familiar laws of motion.
Gist of Idea
Four-dimensionalism says temporal parts are caused (through laws of motion) by previous temporal parts
Source
Theodore Sider (Four Dimensionalism [2001], 6.3)
Book Reference
Sider,Theodore: 'Four Dimensionalism' [OUP 2003], p.217
A Reaction
I keep struggling with the instantaneous natural of temporal parts, and now I find that they have to do the job of being causal relata. When do they do their job? They've gone home before they've finished clocking in. Continuance requires motion?