Job 1:9

Then Satan answered the Lord, and said, Doth Job fear God for nought? Satan insinuates that Job's motive is purely selfish. He serves God, not for love of God, or for love of goodness, but for what he gets by it. Satan is too shrewd to endeavour, as Job's friends do later, to pick holes in Job's conduct. No; that is exemplary. But the true character of acts is determined by the motive. What is Job's motive? Does he not serve God to gain his protection and blessing? Similarly, in modem times, ungodly men argue that religious and devout persons are religious and devout with a view to their own interest, because they expect to gain by it, either in this world, or in the next, or in both. This is a form of calumny which it is impossible to escape. And bad men, who are conscious to themselves of never acting except from a selfish motive, may well imagine the same of others. It is rarely that such an insinuation can be disproved. In the present instance God vindicates his servant, and covers the adversary with shame, as the other adversaries and calumniators of righteousness will be covered at the last day.