Each that we lose takes part of us;
A crescent still abides,
Which like the moon, some turbid night,
Is summoned by the tides.
What does this mean?
The missing portion of the quote is "loved one." When we lose someone we love, a portion (the "crescent") remains. She extends the analogy by comparing the pangs of grief, which never quite subside, with the tidal pull of the moon on a cloudy night.