Only just yesterday as of writing this on the fifth of February, had I heard about the proverb, "You cannot get blood from a stone", meant reportedly to express something impossible.
I immediately went thinking of how one would do it, and in fact there are two ways.
The first: Hit someone over the head with it. Easy.
The second: A bit more involved.
I am no christian or theist overall, and I have not yet verified it with any priests or authorities, so I cannot be sure at least that this is a rigid proof.
However, I do have the miracles necessary layed out here, which have been done. The steps go something like this, as follows. Additionally, I use NRSVUE for my verses here. If You
don't like that, um too bad???
Step 1:
Get water from a stone. This was done twice by Moses, here as an example in Exodus 17:5-6,
"5 The Lord said to Moses, 'Go on ahead of the people, and take some of the elders of Israel with you;
take in your hand the staff with which you struck the Nile, and go. 6 I will be standing there in front of you on the rock at Horeb.
Strike the rock, and water will come out of it, so that the people may drink.' Moses did so, in the sight of the elders of Israel."
Step 2: Turn water into wine. Jesus famously did this, but it is specifically mentioned in John 4:46,
"46 Then he came again to Cana in Galilee where he had changed the water into wine. Now there was a royal official whose son lay ill in Capernaum."
So then now you have wine. Hooray. You now have blood.
Specifically it is said in Matthew 26:27-28,
"27 Then he took a cup, and after giving thanks he gave it to them, saying, “Drink from it, all of you; 28 for this is my blood of the covenant,
which is poured out for many for the forgiveness of sins. "
Hooray, now you have derived blood from a stone!