Can positive thinking enough for make us happy

@sonusd (1545)
India
March 6, 2016 7:39am CST
I read a spiritual book that we should always think positive so that we can stay happy and can perform good things and in that case we will get more success, but I did not find it easy, when I am tensed or frustration it is difficult to think positively.What do you do while you are tensed?
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