"Interviewer: What brings Aristotle closer to Lucretius' statement, “Happy is he who can know the causes of things”? Professor Berti: This is a point that has perhaps not yet been adequately explored because Lucretius was known to be an Epicurean, and Epicureans in ancient times were generally hostile to Aristotle and polemical towards him. Most of the anti-Aristotelian anecdotes preserved in history are of Epicurean origin. Nevertheless, Lucretius, the great Epicurean poet and philosopher, while sharing Epicurus' belief that happiness consists in pleasure – what he calls in Latin “'voluptas”', with which he begins his poem “'De Rerum Natura”' – Lucretius himself states that happy is he who has been able to know the causes of things. Therefore, this pleasure, this happiness, which is clearly an intellectual pleasure, includes knowledge of the causes, that is, the ability to explain phenomena and solve the problems that experience presents us with. And this is ultimately a trait shared by all great philosophers, but also – I would say – by all philosophers, all those who love philosophy, that is, the desire to know, the happiness that comes from solving problems and discovering the causes of why things happen."