A saying from the area of Chinese medicine would be appropriate to mention here: "One disease, long life; no disease, short life." In other words, those who know what's wrong with them and take care of themselves accordingly will tend to live a lot longer than those who consider themselves perfectly happy and neglect their weakness. So, in that sense at least, a Weakness of some sort can do you a big favor, if you acknowledge that it's there.
Source: The Tao of Pooh, Pages: 48
Contributed by: Siona