Numerical Discourse of the Buddha - (V, 198)
114. Well-Spoken Words
If speech has five marks, O monks, it is well spoken, not badly spoken, blameless and above reproach by the wise. What are these five marks?
It is speech that is timely, true, gentle, purposeful and spoken with a mind of loving-kindness.
… Translated by Nyanaponika Thera & Bhikkhu Bodhi