A serious man knows regret and knows it deeply, and he will always know exactly how to make use of his regret for his own upbuilding. A thoroughly half-hearted and light-minded man, on the other hand, is unfamiliar with regret. But one day, some unexpected day, a wind of seriousness might blow through him. Then, all his past carelessness will become worrisome, all his lightness heavy. From sudden regret he will lose himself, and he will flee. Out of fear of regret, he will flee it. And in the end, the half-hearted and light-minded man will live and die having learned scarcely a thing.