133. Speak not harshly to anyone, for those thus spoken to might retort. Indeed, angry speech hurts, and retaliation may overtake you.
134. If, like a broken gong, you silence yourself, you have approached Nibbana, for vindictiveness is no longer in you.
– Dhammapada X – Dandavagga: Violence 133 and 134
Dhammapada verses 133 and 134
