>> “I didn't have time to write a short letter, so I wrote a long one instead.” - Mark Twain

> Usually that false quote is attributed to Blaise Pascal, but I have also seen it being attributed to Albert Einstein.

Not false: Balzac published first, Pascal second:

* https://quoteinvestigator.com/2012/04/28/shorter-letter/

After a quick Google you seem to be right that it is falsely attributed. Blaise Pascal does seem to be the most accepted originator however.