From the forum:
One day a man came to Socrates and said, “Do you know what your friend says about you? Socrates replied, "Before you tell me this news, ask for it through three sits. The first is the Sito of Truth. Are you sure that what you are going to tell me is true? I have heard this from others. You see, you are not sure. The second sitho is the sitho of good. Will this news make me happy? Absolutely not. And finally, the third sito is the sito of benefit. Will this news be useful? I doubt it. You want to tell me a news in which there is no truth or good, and it is useless. Why talk to her then?

The first comment:

This is not a parable, it is a triple filter of Socrates.