In the main, for instance, in real life, S.A.T test is as same as a milestone of one's course of life. Many young people have elaborately prepared for this test. some of them studied it overnight; some of them studied every difficult vocabulary words in the dictionary, which most people don't understand what those words mean. On this occasion, this would make many people believe they would positively pass the exam; however, half of them got wrong. Nearly 90 percent of these teenager were received an unideal test score, why? The crux of the problem was as I have mentioned, lacking of confidence. Ironically, on the contrary, those who didn't study much but had faint on themselves, received score which higher then those who studied overnight over the year i.e. have you seen the gravity of "confidence"?
By comparison, perseverance , diligence, opportunity, etc. are also important, but not the paramount.
As I have mentioned in the first paragraph, "success" are displayed between the word " diligence:, etc. in retrospect, let's imagine those who got confidence but hadn't study any modify practice question of the S.A.T, don't you think whey will receive a ideal score from the test? Probably not. Indeed, confidence is the main factor of doing anything, however, we should use "diligence", "perseverance", " opportunity" to sustain it. As well as building a house, if a house without a stable basic framework, this house will not consider as a good house even you possess the best cement in the world, one day it might laps by earthquake for example.
All in all, base on both example that I provided above, we could see the importance factor of "success".
In recapitulation, "confidence" is the essence of success while it should be sustain with; perseverance, diligence and also opportunity. This is what I personally view of the factor of "success"!
Mainly what I changed other than spellings was to add spacing, (always put two spaces after a full-stop, one after a comma) The letter 'I' on it's own is always a capital letter and always start a sentence with a capital letter.
I hope this helps. I am not a teacher but nobody else had replied in a week!