Humility

Unless you keep acknowledging the role others play in your success, greatness does not last. 
 
 Rightly Colton says ... subtract from a great man all that he owes to opportunity and all that he owes to chance; all that he has gained by the wisdom of his friends and by the folly of his enemies; you will suddenly then find that the great man suddenly looks like a Lilliputian !!!
 
 The other side of greatness is humility