Hello!
Some philosophers held that physical object lacks causal power and couldn't not interact with itself or with other things, that's the philosophic theory of Occasionalism .
So, accordingly, each time water becomes vapour after heated it, each time a ball is shoot, one mustn't conclude there is a causal relation. there is only an illusion of interaction, in fact God influence them each time.
Their argument is the following:
(1) If X is an efficient cause, then neccesarly it cannot fail to cause something
(2)But it's concievable from a priori reasoning that physical objects may fail to cause anything.
(3)Then physical objects aren't necessarly causally efficient.
(4)Consequently, God has to intervene regularly and orderly in the Universe so that any physical interaction can exist.
What do you think of this metaphysics?