His heart is as firm as a stone; yea, as hard as a piece of
the nether [millstone].
] Which must be understood not of the substance but of the qualities of it, being bold, courageous, undaunted, and unmerciful; which is true both of the whale and crocodile, and particularly of the crocodile: Aelianus F26 relates of one sort of them that they are unmerciful, though elsewhere F1, he represents them as fearful.
F26 De Animal. l. 12. c. 41.
F1 Ibid. l. 10. c. 24.