Negative thinking and negative emotions are normal if they appear from time to time. They are harmful however if they become a constant state of living.

If you think negative, you attract negative events. You have to be positive for positivity to happen in your life.

Balendu also talks about people who like to bring the mood of others down just because they enjoy being negative and with negative people. If you however stay and remain positive, they will turn away from you and you will surround yourself with positive people.