[DArcMattr]

The Aristotelian treatment of causality is what's needed here. Objects act in accordance to their nature. Cause and effect is the course of how objects interact with each other. For a given situation, objects A & B will produce the same results if made to interact with each other in a given way.

This is in contrast to the Humean treatment of causality, which is a listing of events where objects play a nominal role.

Let's consider the case of a person considering an argument for determinism. The arguer is presenting a logical sequence of statements building to a conclusion. The considerer is having to focus on each of the presented facts and how they relate to the conclusion. It is this act of focusing which is the core role of volition. The arguer is counting on the focusing act to take place in order to present an argument for determinism. It may be argued that volition can't be proven, but in order to argue against it, it's necessary to rely on volition still the same. Funny thing, volition.