Why diary writing is so important?

It is an intimate affair between you and your diary. You open your pure heart out and talk(write) to your diary.A lot of things go around us and some things make us sick, we want to share it with others but hesitate to do so which in return makes our mental state insane.
Dairy writing helps in this situation. It helps to write our heart out without disclosing it to others.You become creative. You get empowered to write beautiful, emotional, and thoughtful content.While writing down you think about the event in detail, you observe things while writing and slowly you start accepting it.
This brings you close to yourself.