how much "B+ mantra" helps/heals you??

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be positive (B+) mantra works cool when you have to boost up your confidence level , be in "GET SET READY" form , or when negative feelings started cropping your mind. but how useful this "be positive" mantra have in our life. is it really about this mantra that makes you successful or it is just a means to make yourself understand that negativity destroy your ability or capability? if you are eligible whatever mantra you choose it would work wonders for you. how much this "be positive" phrase heals your lost confidence or heals your damaged faith on something or in the other way help to get back to normal?? i believe that its the ability and capability that decide what you can achieve or you have achieved.the willingness ,the desire drives it all. adopting "+" or "-" mantra would only raise your confidence for a time being but this kind of phrases at times makes a person so blind and optimist that s/he denies to accept the reality. optimism is "good" but it is necessary to know how much is ruling your life.