Nathaniel Hawthorne penetrates into the essential truths of the human heart in "Young Goodman Brown", one of his most profound tales. The central theme of the story is the problem of moral growth which Young Goodman Brown can not accomplish through the fallacy of insight. In the story one of the basic causes producing a bad effect on Brown`s morality seems to be the fallacy of insight into the disjunction between reality and appearance. The fallacy inevitably brings about moral weakness that leads to the failure of moral growth. Brown`s failure of moral growth makes his dying hour gloom. This study is to examine the insuperable moral weakness of human being which in the story consists of two main factors. This tale suggests the two factors that may make life gloom can be doubt and arrogance. The acceptance of evil as the final truth about man has turned Brown into a darkly meditative, distrustful human being. Unable to deal with his own frailty, Brown sees and hates it everyone else. Arrogance arise for want of compassion on human frailty and it is detrimental to solidarity. Arrogance, one of the main factors leading life to darkness and failure, may be the moral weakness that author intends to indict through the tale. This arrogance can be considered in connection with the Unpardonable Sin which might consist in a want of love and reverence for the human soul. In conclusion, the truth that the tale pursues seems to be humanity.