Thus Christ, our Lord and Deliverer, was in hell itself for us all; for He truly felt death and hell in His body. But what He did or felt after leaving the body we, of course, do not know. But in life and body He truly tasted hell.
I do not think that His suffering on the cross was so great as this suffering in the garden, because nature could not have endured it. And the fact that He was able to bear such a struggle—a struggle that drew the blood from His body—was truly something great. Luke says: “His sweat became like great drops of blood falling down upon the ground” (22:44). It was not only water; it was pure blood dripping from His body upon the ground.
No one knows what kind of trial that was, and we must pray that we never have to grapple with terrors and distresses of this nature; for we could not endure them. Indeed, the soul, together with the body, would suddenly be annihilated.
Luther’s works, vol. 7: Lectures on Genesis: Chapters 38-44 p 302-303