cast it out
that one verse in proverbs 12 sums up this anecdote quite nicely if you don't want to read any further.
it's been said too many times through history (that included), but you must, above all things, be careful about what you say. once hurtful words escape your lips, it's nearly impossible to repair the damage done. sometimes apologies won't cut it, and other times the only way to "take it back" is to own up completely to what you said by chewing the words a thousand times, swallowing all of it, and then killing off the part of you that said it. and if the person you offended even lets it get that far, consider yourself truly blessed to know them. i've said incredibly hurtful and unkind things to people whose relationships of which i did not realize the true value. and the knowledge of the pain my callous tongue has caused is in itself a pain that can weigh you down for a very long time. not one bit of it is worth the temporary satisfaction you envision in moments of your own blind rage and justification.