“Believe in yourself! Have faith in your abilities!
Without a humble yet reasonable confidence in your own powers
you can not be successful or happy.”
– Norman Vincent Peale
I don’t know about “can not”. Yet, it can make success and happiness much more difficult.
~centerfield6
You can be confident in this: goo.gl/x3rbGm
Schuyler Consulting 
Agree… Right, it does not mean you will not be happy or successful, but it will be more difficult. It’s not easy to be confident if you are constantly doubting your abilities. Easier said than done. But sometimes you just have to trust your instincts.
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Positive/successful experiences bring on/enhance confidence.
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