How to win the Mind battle?

Well, almost everyday we come across various kinds of thoughts. Weather it may be positive or negative, good or bad, rewarding or not so rewarding, and we usually let go all of them. But we should be very careful for the negative ones. Negative thoughts are something almost every person comes across. It may be loss in business, accident, harm to himself, etc. So how to overcome them?
Is it really that hard?

NO. Not really.
Make your positive thoughts stronger then the negative ones. The secret to a good and rich lifestyle is a healthy mind. Negative thoughts are like the algae on your brain. The more you think negatively the unhealthier your mind becomes. So be positive. Be happy!