Hidden by Naomi Shihab Nye.

If you place a fern
under a stone

the next day it will be
nearly invisible
as if the stone has
swallowed it.

If you tuck the name of a loved one
under your tongue too long
without speaking it
it becomes blood
sigh
the little sucked-in breath of air
hiding everywhere
beneath your words.

No one sees
the fuel that feeds you.