Written words are static in nature. Other forms of expression which rely on words such as speech are dynamic.
Written words remain static unless mobilized — which equips the recipient with control over the thoughts and ideas expressed.
This control is crucial because it gives time: A valuable entity.
This available time can be used to imagine, ponder, scrutinize, and eventually decide! This available time can also mean freedom — from haste, from manipulation. Freedom to imagine, contemplate, scrutinize what you like when you like!
You can pause and zoom on a single word for eons and not proceed without having extracted all the necessary juice out of it.
This observation made me derive a quote:
Written words are static content for dynamic minds while other forms which rely on words are dynamic content for static minds.