Thomas Aquinas

To show that his riches are not only sufficient, but also superabundant he says, "His bowels are full of fat," for fat is generated by a superabundance of food. Again, he shows his power is based on numerous supports saying, "and his bones are nourished with marrow,": for bones show strength because their strength is supported by the nourishment of the marrow.

Commentary on Job ↗