²³ 
A shrewd man is reluctant to display his knowledge [until the proper time],
But the heart of [over-confident] fools proclaims foolishness.^(A)

³ 
The one who guards his mouth [thinking before he speaks] protects his life;
The one who opens his lips wide [and chatters without thinking] comes to ruin.

²⁸ 
Even a [callous, arrogant] fool, when he keeps silent, is considered wise;
When he closes his lips he is regarded as sensible (prudent, discreet) and a man of understanding.

¹³ 
He who answers before he hears [the facts]—
It is folly and shame to him.^(A)

²³ 
He who guards his mouth and his tongue
Guards himself from troubles.^(A)