"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.
But I tell you that men will have to give account on the day of judgment for every careless word they have spoken.
For by your words you will be acquitted, and by your words you will be condemned."4
References for Matthew 12:37