But the Lord often leaves his servants, not only to be annoyed by the violence of the wicked, but to be lacerated and destroyed; allows the good to languish in obscurity and squalid poverty, while the ungodly shine forth, as it were, among the stars; and even by withdrawing the light of his countenance does not leave them lasting joy. Wherefore, David by no means disguises the fact, that if believers fix their eyes on the present condition of the world, they will be grievously tempted to believe that with God integrity has neither favour nor reward; so much does impiety prosper and flourish, while the godly are oppressed with ignominy, poverty, contempt, and every kind of cross. The Psalmist says, "But as for me, my feet were almost gone; my steps had well nigh slipped. For I was envious of the foolish, when I saw the prosperity of the wicked." At length, after a statement of the case, he concludes, "When I thought to know this, it was too painful for me: until I went into the sanctuary of God; then understood I their end," (Ps. 73:2, 3, 16, 17).
John Calvin, Institutes of the Christian Religion, 2 Vols
theology