Be silent, or say something better than silence.
Silent - Silence Quotes
Silence is a fence around wisdom.
The silence of a treacherous man is to be feared even more than his words.
Even silence speaks.
Silence is the universal refuge, the sequel to all dull discourses and all foolish acts, a balm to our every chagrin, as welcome after satiety as after disappointment.
To speak wisely may not always be easy, but not to speak ill requires only silence.
We must have reasons for speech but we need none for silence.
Silence fell again. Frodo, even in that fair house, looking out upon a sunlit valley filled with the noise of the clear waters, felt a dead darkness in his heart.
Never speak unless you improve the quality of silence.
Consult with your pillow.