Matthew 12:34-37

"You brood of vipers,
how  can you who are evil
say anything good?
For out of the overflow of the heart
the mouth speaks.
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."
(Matthew 12:34-37) NIV