Prophet SAW said, ‘Whoever believes in God and the Last Day should speak a good word or remain silent.’
This is an exhortion to avoid unnecessarily criticising and engaging in debate. When one criticize or debate, one must #interrupt-your-thinking to ask if the subject is actually wrong and warrants a debate.
One should not remain silent when faced with wrong-doing
If someone among you sees wrong, he must right it by his hand if he can, if he cannot, then by his tongue, if he cannot, then by his gaze, and if he cannot, then in his heart. - Hadith 34, Hadith an-Nawawi
The best of jihad is a just word spoken to an unjust ruler.” - IbnMaja 4011
“To refrain from imitation is the best revenge. — Marcus Aurelius, Meditations”
This is an exhortion to not hurt someone back the same way they hurt you.