The Ancient Greeks in order to gain allies when Xerxes was coming to invade sent to potential allies this idea. They said, "Every mortal is born with a equal measure of good and evil. No exceptions." Thus Xerxes would not, and could not, have unlimited success.
Some people like Bava Sali [Israel Abuchatzeira] in their own way applied this idea to their own lives. They said there is a limit to how much good and pleasure they will have so they voluntarily limited it. It is well known that Bava Sali fasted most of his life from Shabat to Shabat.
