Menachem Mendel Schneerson (1902-1994), a spiritual leader of the Jewish Chabad Lubavitch movement, insisted on delivering a talk the day after he had a serious heart attack.
“‘You must take care of your health,’ the doctor insisted. ‘If not, there is a twenty-five percent chance of a relapse.’ The doctor asked if the Rebbe understood what he had said.
“‘Oh, yes,’ said the Rebbe with a smile. ‘You said that even if I don’t take care of my health—which, I assure you, I will—there is a seventy-five percent chance that there won’t be a relapse.’”
Source: Toward a Meaningful Life: The Wisdom of the Rebbe, 2004.