Why isn't it the keyboard? It is probably just the development and tool evolution!

The pencil is mighty when it has a very sharp point.

The pencil and the eraser are used by people who have enough dignity to admit their own errors. Using the sword is a permanent process, using a pencil is a process that, if love for truth demands, may be reversed, or amended. After all these words (written here, therefore by the use of a pencil, we have the 'edit' button), you can see that swords, pens, permanent inks are buddies, although not so cheerful.