Greatness is not Ego, or arrogance of ones specialities.
Greatness will always be my humanity.
My compassion, nobleness, royalty, integrity.
But, most of all, greatness is humility and my care for others, respect and helpfulness to others. In helping others I help myself, I and remind myself of what it is to human. What it is, is to be pure love, altruistic, sheer care for all.
Examples of Greatness. Mother Theresa, Gandhi, many more I am sure.