Griefs
Analytic eyes
She's studying grief like a scientist—measuring, comparing, collecting data. The clinical language ('measure,' 'analytic') contrasts sharply with the emotional subject.
Date of mine
Grief so old she can't remember when it started. This transforms grief from an event into a permanent condition of existence.
Thousands—on the cause
Notice the wild time scale—she's imagining grief lasting thousands of years beyond death, continuing 'through centuries above' in the afterlife.
Only nails the eyes
Death merely closes the eyes—it doesn't end grief. The verb 'nails' is brutally physical, suggesting a coffin lid.
Passing Calvary
Calvary is where Christ was crucified. She's walking past other people's suffering like stations of the cross, finding comfort in shared pain.
Fashions of the cross
'Fashions' makes crucifixion almost casual—different styles of suffering, like clothing. Darkly ironic word choice for describing how people bear pain.