The pen is mightier than the keyboard

What I was noticing was that I’ve become such a fast typist that I could slam out great big blocks of text quite rapidly — anything that came into my head, it would just dribble out of my fingers onto the screen. That includes bad stuff as well as good stuff. Once it’s out there on the screen, of course, you can edit it and you can fix the bad stuff, but it’s far better not to ever write down the bad stuff at all.

With the fountain pen, which is a slower output device, the material stays in the buffer of your head for a longer period. So during that amount of time, you can fix it, you can make it better, you can even decide not to write it down at all — you can think better of writing it.