It's like this: I have a water-tight barrel, and you have one with a hole in it. You come and ask me to put your wine in my barrel for safekeeping. Then you complain that I won't trust my wine to your leaky barrel. How is that fair? You trusted your secrets to someone who is faithful and careful. Someone who believes that only his own actions can help or harm him — not outside things.
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 (or) useful, and that nothing external is.