It's not the 'the court' won't accept it, it's more likely that opposing counsel will have a field day with something that's obviously fake, or something that can easily be faked.
It would really send up a red flag if you came to court with two or three sheets bound together, and they magically are the ones that have a bearing on the case.
But having an entire journal, spanning several months, and somewhere in it are the two or three pages you need........ that's far less likely to be dismissed.
It would carry more weight if you had to jump around the same book, making a reference to January 21st, March 3rd, June 11th, July 14th, and August 28th instead of having just those 5 pages bound together.