the triple filter test

During the Abbasid period, one of the scholars in Baghdad, the capital of Muslim caliphate at that time, was reputed to hold knowledge in high esteem. One day an acquaintance met the great scholar and said, "Do you know what I just heard about your friend?"

"Hold on a minute," the scholar replied. "Before telling me anything I'd like you to pass a little test. It's called the Triple Filter Test."

"Triple filter?"

"That's right," the scholar continued. "Before you talk to me about my friend it might be a good idea to take a moment and filter what you're going to say. That's why I call it the triple filter test. The first filter is Truth. Have you made absolutely sure that what you are about to tell me is true?"

"No," the man said, "actually I just heard about it and..."

"All right," said the scholar. "So you don't really know if it's true or not. Now let's try the second filter, the filter of Goodness. Is what you are about to tell me about my friend something good?"

"No, on the contrary..."

"So," the scholar continued, "you want to tell me something bad about him, but you're not certain it's true. You may still pass the test though, because there's one filter left: the filter of Usefulness. Is what you want to tell me about my friend going to be useful to me?"

"No, not really..." "Well," concluded the scholar, "if what you want to tell me is neither true nor good nor even useful, why tell it to me at all?"

O you who believe! Avoid most of suspicion, for surely suspicion in some cases is a sin, and do not spy nor let some of you backbite others. Does one of you like to eat the flesh of his dead brother? But you abhor it; and be careful of (your duty to) Allah, surely Allah is Oft-returning (to mercy), Merciful. [Noble Qur'an, Surah al-Hujurat 49:12]