Paul wrote a letter to the churches in Galatia and ended it this way, See how large a letter I have written with my own hand. (chapter 6)
Most scholars believe that Paul's unusual closure to his letter indicates that he had some kind of health problem (perhaps really bad eyesight -- a result of his encounter with Christ on the road to Damascus -- he was temporarily struck blind).
My doctor tells me I see reasonably well for one so aged. Unfortunately I am unable to find enough time to sit and write about the many things I want to pass along to my friends.
So . . . for now I close with these words . . .
See how short a letter I have written with my own hand!