  To fully accomplish this task, La Forge has to disqualify the possibility of a purely body-body interaction and he has to prove that bodies are always moved by a non-bodily cause. To reach this conclusion, La Forge uses an argument by elimination which reviews different potential sources of causal activity and shows that they do not offer a satisfying account of causation. The argument identifies three potential candidates as sources of causal activity in bodies: (i) other bodies; (ii) finite minds (e.g. human minds); and (iii) an infinite mind (i.e. God). La Forge discusses all three options in turn in order to prove that neither (i) other bodies nor (ii) finite minds can be the real causes of bodily movement in nature, and thus only God can be their genuine cause.