I came across a new book which deals with the act of reading, and discusses writing as a medium for learning.
A medium for learning. Enticing!
I see that its theme resembles this:
input = listening (reading),
output = speaking (writing).
One talks about (writes down) concepts yet to be formed, inputting information by listening to them while speaking (reading them again while writing) and can later shape/correct/argue them. It's a process for concepts to form/develop in the mind, then enter short-term memory, and to, if necessary, get internalised by the learner.
So, the four skills are tools for one's mind.
Thinking silently is monodrama.
Thinking loudly via writing (blogging included) is a hope to outreach the monodrama.