The heart of the righteous weighs its answers, but the mouth of the wicked gushes evil. (NIV)
The mind of the [uncompromisingly] righteous studies how to answer, but the mouth of the wicked pours out evil things. [I Pet. 3:15.] (AMP)
The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things. (KJV)