Beware of the anger of the tongue, and control thy tongue! Leave the sins of the tongue, and practise virtue with thy tongue!
Vacīpakopaṁ rakkheyya, vācāya saṁvuto siyā; Vacīduccaritaṁ hitvā, vācāya sucaritaṁ care.
Dhammapada 232
The same idea in other traditions
Keep thy tongue from evil, And thy lips from speaking guile.
A soft answer turneth away wrath: but grievous words stir up anger.
Hold to forgiveness; command what is right; But turn away from the ignorant.
The Master said, "The superior man wishes to be slow in his speech and earnest in his conduct."
By conquering anger he obtains patience; he acquires no Karman productive of anger, and destroys the Karman he had acquired before.
Humility is the word, forgiveness is the virtue, and sweet speech is the magic mantra. Wear these three robes, O sister, and you will captivate your Husband Lord.
Be silent, O thou who knowest many things! for he that speaketh little will be free from reproach on the Day of Judgment. The man of many words is deaf; no counsel does he heed like silence. …