281. The Venerable Sariputta said: “When one who teaches wishes to teach another, let him establish well five things and then teach. What five?
Let him think: ‘I will speak at the right time, not at the wrong time. I will speak about what is, not about what is not. I will speak with gentleness, not with harshness. I will speak about the goal, not about what is not the goal. I will speak with a mind filled with love, not with a mind filled with ill-will.’ When one who teaches wishes to teach another, let him establish well these five things.”
Anguttara Nikaya III.195
Cattāri Brahmavihārā 
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