In Ancient Greece, Aristotle tried to puzzle out the true nature of human happiness. Some posited a ‘hedonic’ form defined by pleasure and the satisfaction of short-term desires. But Aristotle contemptuously dismissed the hedonists, saying that, ‘The life they decide on is a life for grazing animals.’ Instead, he described the idea of ‘eudaemonia’. This is ‘living in a way that fulfils our purpose’, the classicist Professor Helen Morales said. ‘It’s flourishing. Aristotle was saying, “Stop hoping for happiness tomorrow. Happiness is being engaged in the process.”’