If you can't follow your plan when you start losing you don't really have a plan or are too stupid to gamble.
Plan is there to be followed. If you know that you have to quit after hitting certain number and don't do it you should not gamble. What would you say a driver who has to go from point a to point b and then turns half way and gets lost in some woods? If he can't follow the path he should find another job.
definitely this!
discipline equals freedom.
if you're able to trace your first plan, follow it!
if you don't have a plan, don't gamble.
and NEVER hamble with money you can't afford to loose. like rent's money or somebody else's money.