"Make a tree good and its fruit will be good, or make a tree bad and its fruit will be bad, for a tree is recognized by its fruit.1
References for Matthew 12:33
You brood of vipers,2 how can you who are evil say anything good? For out of the overflow of the heart the mouth speaks.3
References for Matthew 12:34
The good man brings good things out of the good stored up in him, and the evil man brings evil things out of the evil stored up in him.