Someone was about to tell me the source but they only had three words left.
Seriously, though, I completely agree with Wisey; regardless of the truth of this idea, it should have absolutely zero impact on the way you live your life – it reminds me of the whole bashert thing. Whether it’s true or not, if you think about it too much you just make yourself crazy and don’t accomplish anything for anyone. It’s nisgaleh after the fact how many words were allotted to someone because, well, that’s how many words the dude spoke, just as it’s nisgaleh after the fact who your bashert is because that’s who you married. Cute idea, should have zero impact on the choices you make in life. (I’m not saying speech isn’t important, or that it shouldn’t be evaluated and thought over before being used, but refraining because you’re afraid you’ll keel over mid-sentence is plain stupidity.)