In The High Impact Leader, Bruce Avolio and Fred Luthans offer what is perhaps a surprising measure of success:
The high bar for success in life may be how many people love you enough to hide you.
Their suggestion comes from an answer Warren Buffet once gave to a student who asked him about how he defined success. Buffet’s answer was inspired by the story of a woman he met who had survived the Holocaust. It was her view that you should consider how successful you are in life, based on the number of people who would be prepared to hide you.