Sometimes, we as humans get into trouble often. Any problem would trigger anger and selfishness in us, which leads to negative thinking in our minds.
I can tell you that those negative thoughts do you no good at all. They bring more disaster than good; a catastrophe would be a good work.
We can avoid this so called catastrophe with positive thinking. Put in good things in your mind and those bad things will go off, or at least countered and neutralized with the good stuffs.
An example will go good for understanding. What if I tell you to observe the following statement?
13 + 5 = 18
26 + 2 = 30
3 + 7 = 10
54 + 3 = 50
20 + 3 = 23
8 + 3 = 10
The first thing that people will say is that some of them are wrong. 26 + 2 is not 30; it is 28 and so on...
But have they forgotten that there are some statements that are correct and they didn't acknowledge it. People tend to mention out what's wrong and and forgetting that some things are actually right.
That's why most people fail to acknowledge the ability of others and point out only the disability.
Think positive, and you will live a happier life.