The different kinds of conversation

‘Ali ibn Abi Maryam narrated on the authority of Tamim Ibn Khalaf who said  that Abu Ishaaq al Fazaari said:
Ibrahim ibn Ad-ham (Rahimahu Allah) used to keep silence for long periods of time, if he spoke I was pleased.
One day he was silent for a very long period of time, I said: "If you speak"
He said: There are four types of dialogue:

1. The kind of conversation you expect to benefict but fear its consequences. It is more virtuous to be safe from such dialogue.
2. The conversation that you do not expect any benefict, also fear its consequences. Letting such dialogue, at least would you benefict is lighten the load on your body and tongue.
3. The conversation that you do not expect any benefict , and are not sure of the consequences. The intelligent person does not charge himself with such dialogue.( This third type was taken by Al Tahdheeb Al Kamaal Haafidh Al Mizzi, as it was included in this narration 'As Samt’. In another report this type of dialogue is described as a poison.)
4. The conversation from which expect benefict and you are sure of its consequences, and this is the kind of dialogue that you should propagate.

Reference: As Samt: Pag. 67 by Ibn Abi ad Dunyaa (Rahimahu Allah)