Proverbs 12:23
He that hath understanding can hide his wisdom; but an indiscreet heart telleth out his foolishness.
Proverbs 13:16
A wise man doth all things with discretion; but a fool will declare his folly.
Proverbs 15:2
A wise tongue commendeth knowledge; a foolish mouth babbleth out nothing but foolishness.
Proverbs 11:13
A dissembling person will discover privy things; but he that is of a faithful heart, will keep counsel.
Proverbs 10:14
Wise men lay up knowledge; but the mouth of the foolish is nigh destruction.
Proverbs 10:19
Where much babbling is, there must needs be offense; he that refraineth his lips is wisest of all.
Ecclesiastes 10:3
A doting fool thinketh, that every man doth as foolishly as himself.
Ecclesiastes 10:12-14
The words out of a wise man's mouth are gracious, but the lips of a fool will destroy himself.