So I tell you this: every sin and slander can be forgiven, except slander against the Spirit; that will not be forgiven. Anyone who speaks a word against the Son of Man will be forgiven; but if anyone speaks against the Holy Spirit, for him there will be no forgiveness, either in this age or in the age to come.Matthew 12:31,32 (REB)
I tell you this: every thoughtless word you speak you will have to account for on the day of judgement. For out of your own mouth you will be acquitted; out of your own mouth you will be condemned.Matthew 12:36,37 (REB)
There's a lot of good teaching about the power of your words and quite often it is supported by references to passages in Proverbs and James. But I found these to passages in Matthew to be strikingly supportive of this as well. Just consider: the only way you can commit the unpardonable sin is by your words. Furthermore, we are ultimately acquitted or condemned on the day of judgement by what we say.
