Let me narrate you a small conversation between chanakya and his disciple
Disciple: Do you know what I just heard about your friend?
Chanakya: Hold on a minute. Before you say anything I would like you to pass a little test. It is called as Triple Filter Test.
Disciple:Triple Filter Test? What is it?
Chanakya: Before you talk to me about my friend, it might be a good idea to take a moment and filter what you are going to say? That is why I called it as Triple Filter Test.
The first filter is Truth
Chanakya: Are you absolutely sure that what you are going to tell me about my friend is true?
Disciple: No, I just heard about it.
Chanakya : All right, you don't know if it is true or false.
The second filter is The filter of goodness
Chanakya : Is what you are going to tell me about my friend is something good?
Disciple: No, on contrary
Chanakya : you want to tell me something bad about my friend but you are not sure whether it is true
The third filter is The filter of usefulness
Chanakya: What you want to tell me about my friend is going to be useful?
Disciple: No, not really.
Chanakya concludes
WHAT YOU WANT TO TELL IS NEITHER TRUE NOR GOOD NOR EVEN USEFUL. SO PLEASE DO NOT CONVEY A WRONG MESSAGE TO ME.
MORAL: Before you speak something, check whether it is useful, meaningful and helpful