O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
O generation of vipers (see the note at Matthew 3:7).
How can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh - a principle obvious enough, yet of deepest significance and vast application. In Luke 6:45 we find it uttered as part of the discourse delivered after the choice of the apostles.