From the Thirty-seventh Psalm : The Bible

The mouth of the righteous speaketh wisdom,
And the tongue talketh of judgment.
The law of his God is in his heart;
None of his steps shall slide.
     -- The Bible: Psalm 37:30-31 (King James Version)

The good mouth will in wisdom bide,
             His tongue of heavenly judgments telleth;
             For God's high law in his heart dwelleth:
What comes thereof? he shall not slide.
     -- Philip Sidney (1554-1586)