We need to externalize ideas to understand better, or to remember better. This can be done by explaining those ideas by ways of writing or talking.
Ideas that remain in your head stay abstract and unclear. Only when explained through language, can they take hold into our brains.
understanding and remembering are similar
Language came from externalization of ideas
New ideas emerge by opposing two ideas
Breakthrough do not come in a flash
You don't understand something until you can describe it simply
Learning is externalizing ideas from where ever ideas come from
Memory is not like a memory stick
It's easier to remember things we understand