Job 40:16

His strength is in his loins, and his force is in the navel of his belly. 20. The places for the seed of coition are said to be in the loins with men, but in the navel with women. For hence it is that the Truth says to His disciples; Let your loins be girded about. [Luke 12, 35] Hence Peter, when keeping away lust from the heart, admonished, saying, Girded up in the loins of your mind. [1 Pet. 1, 13] Hence Paul, when saying that the priesthood of Levi was tithed by the sacrifice of Abraham in the time of Melchisedec, said, in shewing where Levi was then concealed in the body of his father; For he was yet in the loins of his father. But that the seed-vessel of lust is with women contained in the navel, the Prophet witnesses, who, reproving the wantonness of Judaea, under the character of a prostituted woman, says; In the day of thy birth thy navel was not cut. [Ez. 16, 4] For to cut the navel in the day of birth, is to cut off the lust of the flesh at the time of conversion. For since it is difficult to correct evil beginnings, and to mould into a better shape things that have once been shapen amiss, Judaea is blamed from her birth, as having, while born of God, retained her navel unsevered, because she lopped not off the loosenesses of lust. Because therefore both sexes are grievously overcome by the infirmity of lust, through the power of the devil, his strength is both said to be in his loins, against men, and his force in his navel, against women. 21. But why, when He had first mentioned this Behemoth as eating hay, did He subjoin the fatal effects of lust, as the first arguments of his deception? Except that it is plain to all, that after pride has once seized the spirit of a man, he immediately stretches forth to the pollution of the flesh. […]

Second, he describes his conjugal relations. For the principal animal pleasures consist in food and intercourse. He describes the intercourse of the elephant first as to the principle of pleasure by which animals are excited to intercourse when he says, "His strength is in his …

The words "its strength is in its cover" [mean] its strength and vigor are precisely in the animal itself. Animals usually take shelter in different places, but [the author] says this animal does not need a shelter at all.

Lo now, his strength is in his loins,.... The strength of the elephant is well known, being able to carry a castle on its back, with a number of men therein; but what follows does not seem so well to agree with it; and his force is in the navel of his belly; since the belly of the elephant is very tender; by means of which the rhinoceros, its enemy, in its fight with it, has the advantage of it, by getting under its belly, and ripping it up with its horn (s).

Strength - He hath strength answerable to his bulk, but this strength by God's wise and merciful providence is not an offensive strength, consisting in, or put forth by horns or claws, as it is in ravenous creatures, but only defensive and seated in his loins, as it is in other creatures.