Despite of the negativity that surrounds us, like frustration and failure we should still be happy and be positive always, because what we say and what we think today may have a big effect on what will happen to us in the future. Doubt is also one of the common problem and the result of pessimism "don't be a victim of your doubting".
The Secret of Optimist People.
The secret of the optimist people are they don't think too much about the outcome their eyes are just set to the positive outcomes, because they know thinking too much may lead to negative thoughts of the "WHAT IF'S" and eventually would give them negative thoughts and a vision of a negative outcome.
I think one of the good example of a person of optimism is 
Know as we can see the price of cryptocurrency maybe down right now but believe that sooner or later it will go back to their highest price and it will be higher than what we expected.
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