Happiness can boost you for success

Two years ago, when a negative thought about my friend came to my mind.I thought that he was not intersted in semester project and always uses lame excuses. I did not believed in hisexcuses, then I came to know from another source the actual reason of his behavior. Then I realized that I thought totally entire situation , this made ma reallize that never over judge too early or late.
Whenever negative thoughts come to my mind I say that I should consider the positive impact of this thing rather than negative.
We can Improve the positive thinking by 
Doing good deed without any interest just like random act of kindness 
Helping class fellows in study , job and guide the juniors as well etc.I also feel pleasure 
Be humble. Try to greet with peon, common man .
Try to make not complain or blame the conditions or system.
TED talk helped me to improving positive thinking , I specially like the gratitude and random act of kindness steps from this video.
Beside this I add the information from the book that “The secret” by Rhonda Byrne about the positive things .The tips from this book:
Law of attraction : If you think positively the things also happens in a positive way and if you think negatively ,things also happen in a negative way.Positive thinking attracts positive things and negative thoughts attract negative things.
Don’t talk too much without any purpose.