New Revised Standard Version
The tongue of the righteous is choice silver; the mind of the wicked is of little worth.

Contemporary English Version
The words of a good person are like pure silver, but the thoughts of an evil person are almost worthless.

New American Bible
Choice silver is the tongue of the just; the heart of the wicked is of little worth.

Douay-Rheims Bible
The lips of the just teach many: but they that are ignorant, shall die in the want of understanding.

The lips of the just teach many: but they that are ignorant, shall die in the want of understanding.

tongue

Proverbs 12:18 There is that promiseth, and is pricked as it were with a sword of conscience: but the tongue of the wise is health.

Proverbs 15:4 A peaceable tongue is a tree of life: but that which is immoderate, shall crush the spirit.

Proverbs 16:13 Just lips are the delight of kings: he that speaketh right things shall be loved.

Proverbs 25:11,12 To speak a word in due time, is like apples of gold on beds of silver. . . .

Matthew 12:35 A good man out of a good treasure bringeth forth good things: and an evil man out of an evil treasure bringeth forth evil things.

the heart

Proverbs 23:7 Because, like a soothsayer, and diviner, he thinketh that which he knoweth not. Eat and drink, will he say to thee: and his mind is not with thee.

Genesis 6:5 And God seeing that the wickedness of men was great on the earth, and that all the thought of their heart was bent upon evil at all times,

Genesis 8:21 And the Lord smelled a sweet savour, and said: I will no more curse the earth for the sake of man: for the imagination and thought of man's heart are prone to evil from his youth: therefore I will no more destroy every living soul as I have done.

Jeremiah 17:9 The heart is perverse above all things, and unsearchable, who can know it?

Matthew 12:34 O generation of vipers, how can you speak good things, whereas you are evil? for out of the abundance of the heart the mouth speaketh.