Let's think about optimism.
I definitely believe that every person must have to be optimist.
Exept pessimist, who likes to be this :).
Why you must to be optimist?
At first, it influences on yours health.
Every sad/bad thought doesn't go away from your body against it stays and destroys you: headache, backache, poor conditions of skin ans hair etc.
Secondly,i know that no one's opinion should change your opinion about yourself.
You must know what you want and how to gain it.
Another peoples cannot know it,therefore they cannot make fair suggestions.
All in all, i am all for optimism. Forget.
Forgive & Just do it.