Only he who has also raised
his lyre among shadows
may find his way back
to infinite praise.

Only he who has eaten with the dead
from their stores of poppy
will never again lose
the softest chord.

And though the pool’s reflection
often blurs before us:
Know the image.

Only in the double realm 
do the voices become
eternal and mild.

- Rainer Maria Rilke, Sonnet IX, from Sonnets to Orpheus, trans. Edward Snow 

Reading, finding it strangely affecting. It hardly needs my recommendation...