Our minds have an endless stream of thoughts trying to GRAB our attention. You have to learn to quickly recognize those that evokes negative thoughts and JUST FLUSH IT out of your mind.
If you let it GRAB your attention you will have an avalanche of negative thoughts that before you know it they are clogging up your mind.
It's like seeing a cockroach come out of your shopping bag. If you don't squish it immediately, before you know it your house will be infested with cockroaches.
So when a negative thought pops up front and center in your mind JUST FLUSH IT just like you should to prevent an avalanche.
There is no way to prevent negative thoughts from popping up to GRAB your attention. You will have to just learn how to JUST FLUSH IT out of your mind at a quick glance.
Since your thoughts are the reality that you live make sure you GRAB on to the good thoughts and choose the reality you want to live.
And learn how to JUST SQUISH IT.