According to Kundalini Yoga we have three mental bodies. The Negative Mind, The Positive Mind and the Neutral Mind. Let's look into their meaning.
The Negative Mind is our protector.
This mind's job is to keep us safe, to prepare us for all eventualities. It is constantly on the look out for risks that can be heading our way.
For example let's say you are off to a holiday. If you are operating from the Negative Mind you will take out extra insurance, you would have just a bit of extra cash for emergencies.
If you have checked in luggage you will put a change of clothing in your carry on luggage in case your suitcase gets lost. You got the jest of it, you are prepared for everything than can go wrong, but still believe that things can get even worse.
As you can see operating from the Negative Mind is a miserable place to be in. This is where we get anxious, depressed and just manifest negative things in our lives - just to prove that life is hard, we were right to think so. The mantra of the negative mind is 'What could go wrong?'
The negative mind is a wonderful one to keep us safe, be it can be over triggered after trauma or prolonged stress, when the mind is unable to switch to the positive or neutral minds.