“Men all say, "We are wise"; but being driven forward and taken in a net, a trap, or a pitfall, they know not how to escape. Men all say, "We are wise"; but happening to choose the course of the Mean, they are not able to keep it for a round month.”
Source: The Doctrine of the Mean
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Confucius 269
Chinese teacher, editor, politician, and philosopher -551–-479 BCRelated quotes

“Wise men say nothing in dangerous times.”
Wisdom.
Table Talk (1689)

W. M. Torrens Memoirs of William Lamb, Second Viscount Melbourne (1890), p. 234
Attributed

“Wise men speak because they have something to say; Fools because they have to say something.”

Source: Nature of Man and His Government (1959), p. 81

“Wise men speak when they have something to say, fools speak because they have to say something”

“We can be knowledgeable with other men's knowledge, but we cannot be wise with other men's wisdom.”
Book I, Ch. 25
Attributed

“Society speaks and all men listen, mountains speak and wise men listen.”
Frequently attributed to Muir without source. An extensive search of Muir's published and unpublished writings found several sharp and cogent observations concerning society (see above) but not this one.
Misattributed