“So how did altruists survive at all, when natural selection seems to favor the egoist? And eventually, Darwin found a solution. He didn’t write it in Origin of Species, he wrote it in his book The Descent of Man. And he said, ‘Any tribe whose members were altruistic, who were always willing to come to the aid of one another, would be stronger than any tribe whose members were not altruistic.’ Or, as we would put it today, we pass on our genes as individuals, but we survive as groups.”
– Rabbi Jonathan Sacks