Here is a typical instance of the grammatical error. Edwards wrote:
(1) Arminian liberty of will consists in the will’s determining its own acts . . .
and his error-rich editor (ERE for short) changed this to
(2) Arminian liberty of will consists in the will determining its own acts . . .
This is now sanctioned by the Oxford University Press, one of whose editors introduced it throughout a book of mine a few years ago, forcing me to go through the whole typescript cleansing it. But it is an error. What it produces is a mistake, wrong, ungrammatical, indefensible.
Here are two reasons for saying this.
First reason: The error turns something that can be grammatically explained or analysed into something that cannot. (1) says that Arminian liberty consists in an act of self-determination. Whose act? The will’s.
Nothing corresponding to this can be done for (2). The word-sequence ‘the will determining its own acts . . .’ isn’t a recognisable grammatical entity.
Another example of the error:- Edwards’s correct
(3) I would inquire whether the will’s coming to a determination to do so isn’t the same thing as the soul’s coming to a choice to do so
was changed by his ERE to
(4) I would inquire whether the will coming to a determination to do so is not the same thing as the soul coming to a choice to do so.
There is no way of cleanly construing (4). Trying to move towards an understanding of it, one naturally thinks that it includes something of the form ‘whether the will [blah blah] is not the same thing as the soul [blah blah]’. But of course what is meant by (3) isn’t about equating the will with the soul, but rather equating a certain will-event with a certain soul-event. (Perhaps that equation entails that the will is the soul; but that isn’t what it says.)
Second reason: In many instances, everyone shrinks from the error, feeling that the possessive is required in the context of ‘-ing’. To avoid it in those cases while implementing it in others is to strike a further blow against the rule-guidedness (and thus the ultimate intelligibility) of our language. That wouldn’t be so if there were a clean line around the cases where the error feels wrong even to error-makers, but there isn’t. Very many of them involve possessive pronouns, including the following from the opening three pages of the error-mauled version of Edwards’s book:
(5) The thing next chosen, or preferred, when a man wills to walk is not his being removed to such a place where he would be, but such an exertion and motion of his legs and feet. . . .
Had the ERE remained true to his error, he would have written ‘is not him being removed’, which would have sounded grotesque, even to him.
(6) And his willing such an alteration in his body in the present moment is nothing else but his choosing or preferring such an alteration in his body at such a moment, or his liking it better than the forbearance of it.
Fidelity to the error would require ‘him willing’, ‘him choosing’ and ‘him liking’.
But it isn’t only with pronouns that the ERE shrinks from his error. This is also from the abused version of Edwards:
(7) . . . or that a man’s choosing, liking best, or being pleased with a thing, are not the same as his willing that thing.
Perhaps he left the possessive “man’s” untouched here because if you change that to “man”, you get “. . . a man choosing, liking best, or being pleased with a thing, are not the same as . . .”, and the singular “man” clashes with the plural “are”. Just so; what is being talked about is not a man blah blah, but a choosing, a liking best, a being pleased with - three items. Whose choosing etc.? A man’s.
But in the very next sentence, though the ERE still suspends the error for the pronoun, he returns to it for the noun:
(8) Thus an act of the will is commonly expressed by its pleasing a man to do thus or thus; and a man doing as he wills and doing as he pleases are in common speech the same thing.
The very same noun, and another case of singular/plural trouble; perhaps the difference the ERE felt between these comes from there being three items in (7) but only two in (8), which is less plural!
This is chaotic: the ERE was steering by vague, unexamined intuitions that had nothing principled behind them. The obviously best way out of the chaos is to restore the possessive in every instance.
There is an excellent further discussion of this matter on the internet.