How to stop negative thoughts from entering your mind?

I used to find that trying to control negative thoughts by blocking them out in my mind.. fighting them in essence.. was unsuccessful. A small change that I may and that I find works for me is having something outside of my mind that is a trigger for cutting off a negative thought. When a negative thought enters my mind, I click my fingers and recite to myself words to the effect that I am not going to entertain that thought. I then try and think of something positive. Something that makes me smile; some time of being cared; some positive thought to replace it with on an unrelated subject. Works for me anyway and now the negative thoughts are controllable.

for every negative thought try to think one positive one. Sometimes we think everything is horrible because we focus only on the bad.

Let's be straight - you can't stop thoughts from entering your mind sometimes. If you deliberately try to supress certain thoughts you can actually make them more likely to surface! (It's known as the ironic process theory) So relax, accept that you can't stop certain thoughts from entering your mind sometimes, but that's not a bad thing! We all have thoughts we don't like, but that's all they are - thoughts. They don't change anything. It's your actions that define you! So instead try spending your time in more productive and positive ways such as by getting exercise or hobbies, being mindful and in the moment.

Simple, calm down. Take few deep breaths. Realize that is just your mind playing tricks. Accept them. And let them go. You need to learn to accept negative thoughts as a part of you, and learn to let them go.

I have found that this takes practice and training, so what I've done is to ever day write down three things for which I'm grateful. That makes me generally more positive, and when something bad happens I'm more likely to see the good that's in with the bad.

The best way to stop negative thoughts from entering your mind is by keeping yourself distracted but also learning to love those parts of you which you may have previously considered flaws. Doing these things have really helped me prevent a lot of negativity entering my life.

Negative thoughts will come and go, you can't stop them. You should embrace them so you may learn from them and be more prepared the next time!

By not giving them any power over you, thoughts are just thoughts at the end of the day. Watch them pass by and go just the way clouds do.

I don't think it's possible to stop them entering but in order to dull them they must be shared or the person must come to a realization of their unimportance.

By diverting your mind into something else in which you think can distract you most and also do things in which you think is fun and can enjoy the most and be happy about it. Think of a good memory that can also lead to positivity thoughts or dream about something you love or like :)