Proverbs 10:20
"The tongue of the just is as choice silver: the heart of the wicked is little worth."
Cross References (ranked by relevance)
And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually.
There is that speaketh like the piercings of a sword: but the tongue of the wise is health.
The heart is deceitful above all things, and desperately wicked: who can know it?
And the LORD smelled a sweet savour; and the LORD said in his heart, I will not again curse the ground any more for man’s sake; for the imagination of man’s heart is evil from his youth; neither will I again smite any more every thing living, as I have done.
A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.
For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.
My fruit is better than gold, yea, than fine gold; and my revenue than choice silver.
Righteous lips are the delight of kings; and they love him that speaketh right.