Flesh and blood

is equivalent to blood in its twofold form, or rather as formed and formless.

Water and blood

has, therefore, two meanings in St. John, but which

in idem coincidunt

:

  1. true animal human blood, and no celestial ichor or phantom:
  1. the whole sentiently vital body, fixed or flowing, the pipe and the stream.

For the ancients, and especially the Jews, had no distinct apprehension of the use or action of the nerves: in the Old Testament

heart