As a general rule, spirits speak to when spoken to, or when something reminds them of their fondest memories. Essentially, they react to stimulus akin to that they experienced during their first existence. So, in an area like mine, where I live across the street from a graveyard, sometimes I'll say something or make a noise that sets them off and I'll hear them talking amongst themselves, or to me. Most of the time it's a minor inconvenience, but it is possible.
If you're completely silent, I kind of doubt they're spirits unless they desperately want to get their message heard.
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"It is not a garment I cast off this day, but a skin that I tear with my own hands." Kahlil Gibran, The Prophet
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