The secret to a rich and happy life, forsooth?
There are so many, ranging from y en el monte nada, nada, nada through a policeman's lot is not ... to vanitas vanitatum and Paul's Not as though I had already attained,
But I think we have to go with Solon's dictum to Croesus http://classics.mit.edu/Herodotus/history.1.i.html , to judge no man happy till after he dies:
"He who unites the greatest number of advantages, and retaining them to the day of his death, then dies peaceably, that man alone, sire, is, in my judgment, entitled to bear the name of 'happy."