Squeeze blood from a stone.
why not?
This expression - used to describe an impossibility
no matter how hard I squeeze - the effort put forth
nothing comes out.

Today I make truth from the tale.

For behold!
After hours and hours of squeezing there is blood on my hands
and a very thin trickle pours off that stone onto the ground.
Yes, blood from a stone.
You know what they say: No pain, no gain.
my hands slick and raw from the effort

And they said it couldn't be done...