Habits

I’ve always heard that habits are hard to break. In my life, that has generally proven to be true.

I’ve also heard that research has proven that it takes 21 days of repeated repetition to form a new habit.

Why then do people who do something repetitively for five or six months always find it so easy to break the habit they have maintained for that period of time? Should it not be ingrained and hard to break? I mean if it only takes 21 days to create the habit, shouldn't it be unbreakable in 6 months?

If we can find why something that needs changed is so hard to do, yet something so right is so easy to walk away from, even after the habit is formed, we will be able to break the chains of bondage for so many people.