The true worth of knowledge is in being able to apply it when it is required the most. For what worth is all the knowledge you have in the world when it can't answer the simple question life poses to you. Forget life. You may it's broad. Take the exams that you have given so far. At one point or the other there is that just one particular question which you would be able to answer even in the middle of the night when woken up from sleep but it simple tends to miss you at that instance while answering the question. Gone, you have missed those marks. Yet another example could be of that of an interview. The interviewer asks you a question which one of the most simplest one he could have ever asked given your experience and expertise and you end up make a total mess of it, only to walk out and realize "Oh! my God, how could I not answer that". Or for that matter when your boss asked you for suggestion...and you could not come up with any or may be you had a suggestion ...