You offspring of vipers, how are you, being evil, able to speak good things? For the mouth speaks what overflows from the heart. Bible other translations

“What overflows from the heart.” This is why the wise person guards their heart, because out of it are the issues of life (Prov. 4:23). The Bible says in many different places that what comes out of the mouth originates in the heart (see commentary on Matt. 15:18).

Commentary for: Matthew 12:34