2 I thought of a better way to word it.
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No sentence exists before it is completed. A self-referential sentence speaks as though it had already been completedexists as a sentence -- even before any sentence exists to refer to as "this sentence". Thus it has been completed, and thus would have to pre"pre-exist itselfits own existence" in order to be meaningful. So theyself-referential sentences are meaningless.

No sentence exists before it is completed. A self-referential sentence speaks as though it had already been completed before it has been completed, and thus would have to pre-exist itself in order to be meaningful. So they are meaningless.

No sentence exists before it is completed. A self-referential sentence speaks as though it already exists as a sentence -- even before any sentence exists to refer to as "this sentence". Thus it would have to "pre-exist its own existence" in order to be meaningful. So self-referential sentences are meaningless.

1
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No sentence exists before it is completed. A self-referential sentence speaks as though it had already been completed before it has been completed, and thus would have to pre-exist itself in order to be meaningful. So they are meaningless.