Speak only if it improves upon the silence.

Fools multiply when wise men are silent.

Silence is the only answer you should give to the fools. Where ignorance speaks, intelligence should not give advices.

The most beautiful words of love are told in silence for a look.

For both parties in a controversy, the most disagreeable way of retaliating is to be vexed and silent; for the aggressor usually regards the silence as a sign of contempt.

Nothing strengthens authority so much as silence.