Very often you will hear someone emphasize on the importance of persistence. However, it will be interesting to note that having the habit of persistence doesn't mean will bring you success.
In the cartoon you will see some points on what persistence is 'not'... if you are persistent, but you persist in doing the wrong things, then that persistence will not be good for you.
However, though we know that being persistent is a good habit, we must be wise to choose the right things and persist. Having said that, we got also to be wise to know when to stop and change our focus when something is clearly not within our control.
Therefore being persistent is one thing.
Having the wisdom to choose what and when to persist is another.