You can fool all the people some of the time, and some of the people all the time, but you cannot fool all the people all the time.
eta just checked your link, and it gives "please". One I checked had "fool". Checking snopes now
Found my one :
If you once forfeit the confidence of your fellow citizens, you can never regain their respect and esteem. It is true that you may fool all of the people some of the time; you can even fool some of the people all of the time; but you can't fool all of the people all of the time. -Speech at Clinton, Illinois, September 8, 1854.