Pitágoras

“A fool is known by his speech; and a wise man by silence.”

Ability and necessity dwell near each other.

In anger we should refrain both from speech and action.

It is better wither to be silent, or to say things of more value than silence. Sooner throw a pearl at hazard than an idle or useless word; and do not say a little in many words, but a great deal in a few.