Answer: This passage speaks about man’s spiritual vessels regarded as “brain-bones-tendons-flesh-skin,” the five spiritual degrees. We have to come to a spiritual state which can be described as “all bones will speak.”
This is a revelation in a very powerful, internal spiritual vessel of the “bones,” the vessel for the Light of Hochma (Wisdom), which already contains “marrow” (the Light of Hochma). “All bones will speak” is an action when the spiritual vessel, “bones,” which contains the Light of Hochma in it, eventually reveals this Light in the “tendons,” Bina, an even more external vessel.
I wish you this kind of revelation! As to the corporeal bones, don’t worry about them; we know exactly how they end.
Try to perceive the materials we read not in their corporeal, but authentic sense. We read books that talk about the soul, not about our biological body. The body is regarded as “matter” or “a donkey” (Homer), and its fate is the same as that of all other animals who live and die.
But for as long as it lives, we ought to manage to revive our spiritual body: to resurrect it from the dead. If the soul is dead at the moment, revive it! Draw the Light to it that will breathe life into it.
From the 3rd part of the Daily Kabbalah World 6/24/2011, General Introduction to the Book, Panim Meirot uMasbirot