As a vessel is known by the sound, whether it be cracked or not; so men are proved, by their speeches, whether they be wise or foolish.

There is one safeguard known generally to the wise, which is an advantage and security to all, but especially to democracies as against despots - suspicion.

A wise man was once foolish

The wise can learn from the foolish as the foolish can learn from the wise

As a vessel is known by the sound, whether it be cracked or not; so men are proved, by their speeches, whether thy be wise or foolish

The empty vessel makes the loudest sound.