It must also be emphasized that objections to the principle of causality which appeal to quantum mechanics are, ultimately, appeals to laws of physics. But as we saw in earlier chapters, for the Aristotelian, a law of physics is essentially a shorthand description of the way a thing will behave given its nature or substantial form. Thus, to explain something in terms of the laws of physics is hardly an alternative to explaining it in terms of the actualization of a potential. For the substantial form of a physical substance relates to the substance’s prime matter as actuality to potentiality.
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