The biggest trait of great personalities is that they believe in excellence. They take nothing for granted and think independently. They are always ready to challenge the established thoughts.
There is a Hindi poem: Leek Leek Gadi Chale, Leek hi chale kupoot; Bina leek ke teen hai- Shayar, singh, Sapoot (the train and unworthy son follow the beaten track; the poet, tiger and worthy son follow their own path.)