Marie Kondo has discovered a wonderful technique to tidying up the mess. As I see, we can use the principle to tidying the house or even to tidying our mind. I reproducing here the main theme to keep in mind before tidying up:
Effective tidying involves only two essential actions:
1. discarding things
2. where to store things
This principle does not change.
The rest depends on the level of tidiness you personally want to achieve.
Source – Marie Kondo :: The Life-Changing Magic of Tidying: A simple, effective way to banish clutter forever