When interpreting a legal document one must consider the language of the document contained within the four corners of that document as prima facie evidence of the meaning of those executing that document.
Only lawyers and leftists could invent the living constitution, subject to the whims of the loudest people in the room.
When the four corners of a contract are considered, that settles the meaning of the contract. Only in circumstances where some real ambiguity is created, may other evidence, called extrinsic evidence, be considered in interpreting a legal document.
I have previously mentioned that Lino Graglia, a great con law professor at Texas, says that originalism has been been discarded by so many judges who impose their preferences and invent excuses.
Here is a review of a new book on the US Constitution.