“Wise men think and speak alike.”
“Wise men speak only of what they know”
“When all men think alike, no one thinks very much.”
“Wise men speak when they have something to say, fools speak because they have to say something”
“Fools and wise-folk are alike harmless. It is the half-wise, and the half-foolish, who are the most dangerous.”
“Wise men, when in doubt whether to speak or to keep quiet, give themselves the benefit of the doubt, and remain silent.”