John Wesley on Job 15:20

Pain - Lives a life of care, and fear, and grief, by reason of God's wrath, the torments of his own mind, and his outward calamities. Hidden - He knows not how short the time of his life is, and therefore lives in continual fear of losing it. Oppressor - To the wicked man: he names this one sort of them, because he supposed Job to be guilty of this sin, in opposition of what Job had affirmed of the safety of such persons, chap.12:6, and because such are apt to promise themselves a longer and happier life than other men.