Negative thinking appears to be more prevalent than positive thinking. It seems that with most people, positive thinking requires some effort, whereas, negative thinking comes easily, and often uninvited. This has much to do with education and the environment one has been living in. If you have been brought up in a happy and positive atmosphere, there is more probability that it will be easier for you to think positively. However, If you have been brought up under poor or difficult situations, you will more probably be more inclined to negative thinking. This negative thinking leads to repeated negative thinking.