I searched on Google and found many interesting quotes, however, this one caught my attention, because it is simple, short and it is something I believe we all can agree on. I am leaving the name of webpage where I found this quote, in case any of you want to check it out.
"This was my first lesson about gambling: if you see somebody winning all the time, he isn't gambling, he's cheating. ” – MALCOLM X
Source: notable-quotes
I do not see a tenacity in this, not everyone who's on a continuous win is a cheat, for some many, it's luck