Generally, if uncertainly, attributed to Honoré de Balzac (1799 – 1850), the line is still interesting in its force: "Behind every great fortune, there is a great crime."
Whether or not Balzac wrote those exact and more pithy words, he did write in "Le Père Goriot" "The secret of a great success for which you are at a loss to account is a crime that has never been found out, because it was properly executed."
A properly executed crime -- one whose particulars remain hidden -- wreathes the success in unassailable light. I think that is probably true, but I don't think it's a good idea for individuals to fall prey such much-accepted activity.
I don't mean that anyone would want to run around raining on every available parade, playing the cynic and pessimist. I do mean that good things carry less-glorifiable elements and that those elements deserve attention and care.
Yin and yang are not just some symbol on a Chinese restaurant. They are the way of the world and failure to accord with the way of the world is bound to encourage uncertainty and sadness.
Success -- yes. Examine it.
Failure -- yes. Examine it.
Where is the resting place of all the pros and cons?