Letters from a Stoic 68 : 6

When you withdraw from the world your business is to talk with yourself, not to have men talk about you. But what shall you talk about? Do just what people are fond of doing when they talk about their neighbours, – speak ill of yourself when by yourself; then you will become accustomed both to speak and to hear the truth. Above all, however, ponder that which you come to feel is your greatest weakness.