Job studied to do good to all and particularly to help those who had no one else to turn to. He had that delight which the believer alone has in doing good, not to be seen by men but by God, to do good for its own sake.
Job genuinely did all this good from right motives, and yet even a good man is in danger of pride. He can do genuine good and yet he can reflect too much on his deeds and admire them too much. Christ tells us that our left hand should not know what our right hand is doing, for this self-knowledge can so easily turn into self-congratulation, which can then become a sense of superiority and pride. Thus Satan tricks us into thinking too well of ourselves. Whether Job fell prey to this the passage does not say, but Satan no doubt worked him over.