References – AN 4.183: Vassakāra on What is Heard 
Comment by Ajahn Jotipālo: Discerning what to say based on skillful and unskillful mental qualities (AN 4.183) seems tricky. [Skillful qualities] [Unskillful qualities] [Right Speech]
Response by Ajahn Pasanno. [Unwholesome Roots] [Suffering]
Sutta: AN 4.192: Facts.
Right Speech and Living with Ourselves [2016], Session 1, Excerpt 3
“When is it useful to discuss the conduct of another person?” Answered by Ajahn Pasanno. [Malicious speech] [Virtue] [Right Speech]
Sutta: AN 4.183: Speak when unwholesome qualities decrease and wholesome qualities increase.
Right Speech and Living with Ourselves [2016], Session 1, Excerpt 8