Thematic Bible: Tree and its fruit

For sound trees do not bear bad fruit, nor bad trees sound fruit. Every tree is known by its fruit. They do not pick figs off thorns, or gather grapes from brambles. A good man, out of the good he has accumulated in his heart, produces good, and a bad man, out of what he has accumulated that is bad, produces what is bad. For his mouth says only what his heart is full of.