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Knowledge is the barrier. Having it is a Success and not having it is a failure.
Failure once you did not attain a certain goal or objective.
Success one you achieved your goal.
In life we have to have goals, but be realistic, work on it, focus on the task, challenge your self, don't set your goal too high it is a mere FAILURE again be realistic but if you fail it does not matter what matter is the way you do the task in order to attain your goal and learn from your mistake and start all over again...
For me, success is to maintain your professional and personal life.