Cross-references Explore similar Bible verses on Matthew 15:18 in English Standard Version "But what comes out of the mouth proceeds from the heart, and this defiles a person." Mt 12:34 You brood of vipers! How can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks. Jas 3:6 And the tongue is a fire, a world of unrighteousness. The tongue is set among our members, staining the whole body, setting on fire the entire course of life, and set on fire by hell.