It's the third day of my writing this blog.
3rd day is the day when many people give up their diary.
We call it "Mikka Bouzu", "Mikka" means "for three day" and "Bouzu" is "a Buddhist priest".

The origin of this idiom is like this: You need such hard training to be a whole Buddhist priest that many give up soon in first 3 days.

We usually use this idiom to refer to keeping diary.
Is it such hard training to find something to write about everyday in your life?