[The Coming into Being of the World and Bodies]
Al-Rāzī said:

“The second proof: Every body is of finite magnitude, and everything of finite magnitude has a beginning.”

He established the second premise as follows:

“Something of finite magnitude could be larger or smaller. Its having this particular magnitude rather than either alternative must therefore be due to a determining factor acting by choice; otherwise, one possibility would have prevailed without a determining factor. And the act of an agent acting by choice has a beginning.”

[Al-Urmawī’s Objection]
Al-Urmawī said:

“One may dispute that this entails one possibility prevailing without a determining factor.”

[Ibn Taymiyyah’s Comment]
I say:

The substance of his objection is that he is saying: We do not concede that, if the determining factor for the magnitude does not act by choice, it follows that one possibility prevails without a determining factor. Rather, it may be something that necessarily entails that magnitude,