Where does the following come from?

We may die but what hast thou to do with death?
Thy glory is departed from thee. Bow thy head in the dust, for dust
doth cover thy most beautiful forms and the canker doth eat away thy
wisdom.

? a connection with "celestial jewellry" or am I throwing a spanner in
the works? Is this a seperate query, unconnected?

Where did you see this quotation? Are you sure it is exact?

It sounds like something philosophical, an argument against fearing
death? I remember either a Stoic or an Epicurean comment going
something like 'what do the living have to fear of death, for where
they are it is not, and when they are dead they are unable to fear'.
That's not really relevant to your question I guess, except is your
quote in that sort of context?