'Marrow' in the Bible
His pails are full of milk [his veins are filled with nourishment], and the marrow of his bones is fresh and moist,
My whole being shall be satisfied as with marrow and fatness; and my mouth shall praise You with joyful lips
It shall be health to your nerves and sinews, and marrow and moistening to your bones.
And on this Mount [Zion] shall the Lord of hosts make for all peoples a feast of rich things [symbolic of His coronation festival inaugurating the reign of the Lord on earth, in the wake of a background of gloom, judgment, and terror], a feast of wines on the lees -- "of fat things full of marrow, of wines on the lees well refined.
For the Word that God speaks is alive and full of power [making it active, operative, energizing, and effective]; it is sharper than any two-edged sword, penetrating to the dividing line of the breath of life (soul) and [the immortal] spirit, and of joints and marrow [of the deepest parts of our nature], exposing and sifting and analyzing and judging the very thoughts and purposes of the heart.