In Chapter Two Saint Thomas discusses God allowing Satan to afflict Job in his flesh:
Though repulsed, Satan does not rest, but still provides calumny wanting to show that every good which Job did, even the very fact that he had patiently tolerated his adversity, he had not done for the love of God, but for the health of his own body. So the text continues, “Then Satan answered the Lord: Skin for skin! All that man has he will give for his life.” We must reflect that Job had been afflicted in two ways: the loss of his possessions and the loss of his children. Satan therefore intends to say that Job had patiently tolerated both afflictions because of the health of his body and this was no great virtue in this, but was human and usual among men. This is what he says, “man,” as though anyone even those without virtue will easily give, “skin for skin!” that is, the flesh of another in place of his own. For a man who is not virtuous will maintain that anyone else, even those closely related to him in any way, should be afflicted in body rather than himself. For the same reason every man regardless of who he is, will give all the exterior goods he possesses “for his life,” that is, to preserve his own life. For exterior goods are sought to preserve life, like a supply of food and clothing and other such things which maintain the life of man comfortably.
Since someone could say to Satan, “How can you prove that Job bore patiently with the loss of his children and his possessions because he feared for his own skin and his own life?”, he now adds, as though in answer to this objection, “But now,” if you do not believe mere words,” put forth your hand,” i.e., exercise your power,” and touch his bone and his flesh,” i.e., afflict him in body, not only on the surface which is what to touch the flesh means, but also in its inmost part, which is what to touch the bone means, so that touch reaches to his inmost part. “And you will see,” i.e., everyone can clearly perceive, “that he will bless (curse) you to your face,” which must be interpreted as above.
Therefore the Lord willed to show that Job had not served God for the health of the body, just as he had already shown that Job did not serve him because of exterior goods, and so the text adds, “The Lord said to Satan: Behold, he is in your hand,” i.e., I commit power to you to afflict him in body, “only spare his life,” i.e., do not cannot take away life from him. For God does not totally expose his servants to the will of Satan, but according to a fitting measure, as St. Paul says in 1 Cor., “The faithful God does not suffer you to be tempted beyond what you can endure.” (10:13)
Go here to read the rest. Satan I think is barking up the wrong tree here. I have had two bouts of kidney stones, and the intense pain I experienced each time remains vivid in my memory. However that pain was as nothing compared to the grief that I experienced eight years ago when my son Larry died. Of course people come in many types, but Job was a just man so I assume the death of his children would be the greatest blow for him.