Lionel Windsor has written some excellent short posts on the word-y nature of salvation and therefore the word-y nature of our Christian lives:
The whole thing is very worth reading. I particularly enjoyed Lionel's analysis of the relationship between: words / law / gospel in Romans. In Romans 1-3 words are a disaster area because we're in the arena of law. "Word" only convicts us or make us hypocrites. Really it's only once we get to Romans 10 that words become a good thing. But more than this - they become the very essence of our salvation. Words go from condemning to life-giving through the gospel. (Therefore, if we're feeling condemnation surround our 'gospel' speech, perhaps it's because we're thinking in law not gospel terms!)
All this follows the pattern (as the third post points out) of Sin => Salvation => Speech evident in places like Deuteronomy 32; Psalm 51 and Isaiah 51.
Read the whole thing!