When a man has seemed to us to have talked with simplicity about his own affairs, how is it that at last we are ourselves also induced to discover to him our own secrets and we think this to be candid behavior? In the first place, because it seems unfair for a man to have listened to the affairs of his neighbour, and not to communicate to him also in turn our own affairs: next, because we think that we shall not present to them the appearance of candid men when we are silent about our own affairs. Indeed men are often accustomed to say, “I have told you all my affairs, will you tell me nothing of your own? where is this done?” Besides, we have also this opinion that we can safely trust him who has already told us his own affairs; for the notion rises in our mind that this man could never divulge our affairs because he would be cautious that we also should not divulge his. In this way also the incautious are caught by the soldiers at Rome. A soldier sits by you in a common dress and begins to speak ill of Caesar; then you, as if you had received a pledge of his fidelity by his having begun the abuse, utter yourself also what you think, and then you are carried off in chains.

Something of this kind happens to us generally. Now as this man has confidently intrusted his affairs to me, shall I also do so to any man whom I meet? For when I have heard, I keep silence, if I am of such a disposition; but he goes forth and tells all men what he has heard. Then if I hear what has been done, if I be a man like him, I resolve to be revenged, I divulge what he has told me; I both disturb others and am disturbed myself. But if I remember that one man does not injure another, and that every man’s acts injure and profit him, I secure this, that I do not anything like him, but still I suffer what I do suffer through my own silly talk.

“True: but it is unfair when you have heard the secrets of your neighbour for you in turn to communicate nothing to him.” Did I ask you for your secrets, my man? did you communicate your affairs on certain terms, that you should in return hear mine also? If you are a babbler and think that all who meet you are friends, do you wish me also to be like you? But why, if you did well in entrusting your affairs to me, and it is not well for me to intrust mine to you, do you wish me to be so rash? It is just the same as if I had a cask which is water-tight, and you one with a hole in it, and you should come and deposit with me your wine that I might put it into my cask, and then should complain that I also did not intrust my wine to you, for you have a cask with a hole in it. How then is there any equality here? You intrusted your affairs to a man who is faithful and modest, to a man who thinks that his own actions alone are injurious and useful, and that not............