An individual's greatness cannot be judged objectively by his or her contemporaries; the most objective evaluators of a person's greatness are people who belong to a later time

When we retrospect our history, we are not surprised to find so many great persons whose brilliances enlight the development of human's civilization, despositing achievements and accomplishments in all aspects of people's lives, such as literature, painting, astronomy, religion and so on. While most of the geniuses were not regarded so great nowadays as in their eras, there greatness would have to be objectively evaluated by the people in a later time. As is stated …

…no enough time and evidence to judge the value of their accomplishments standing on the objective position. In conclusion, the real value and greatness of geniuses could not be judged objectively by the contemporaries for the circumscription and restraint in that speical era, and only the people living in the later time have the chances to evaluate a person's greatness. Though people are unwilling to admit the cases of impartiality, the reality is that ineluctably.