Our enemy is not merely spiritual. Remember that he has the strength of twenty men, and that, though our necks or our windpipes are of the common kind – and therefore breakable or crushable – his are not amenable to mere strength. A stronger man, or a body of men more strong in all than him, can at certain times hold him; but yet they cannot hurt him as we can be hurt by him.
– Bram Stoker
Dracula, Chapter 19. Van Helsing’s warning to the group of vampire hunters on the Count having the strength of twenty men. They are on a mission to break into Dracula’s house at Carfax, where they believe Dracula is keeping fifty boxes of earth in the chapel.