Ephesians 5:20

"But if thou give thanks when thou art in comfort and in affluence, in success and in prosperity, there is nothing great, nothing wonderful in that. What is required is, for a man to give thanks when he is in afflictions, in anguish, in discouragements. Utter no word in preference to this, 'Lord, I thank thee.' And why do I speak of the afflictions of this world? It is our duty to give God thanks, even for hell itself, for the torments and punishments of the next world. For surely it is a thing beneficial to those who attend to it, when the dread of hell is laid like a bridle on our hearts. Let us therefore give thanks not only for blessings which we see, but also for those which we see not, and for those which we receive against our will. For many are the blessings He bestows upon us, without our desire, without our knowledge. And if ye believe me not, I will at once proceed to make the case clear to you. For consider, I pray, do not the impious and unbelieving Gentiles ascribe everything to the sun and to their idols? But what then? Doth He not bestow blessings even upon them? Is it not the work of His providence, that they both have life, and health, and children, and the like? And again they that are called Marcionites, and the Manichees, do they not even blaspheme Him? But what then? Does He not bestow blessings on them every day? Now if He bestows blessings on them that know them not, much more does he bestow them upon us. For what else is the peculiar work of God if it be not this, to do good to all mankind, alike by chastisements and by enjoyments? Let us not then give thanks only when we are in prosperity, for there is nothing great in this. And this the devil also well knows, and therefore he said, 'Doth Job fear God for nought? Hast Thou not made an hedge about him and about all that he hath on every side? Touch all that he hath; no doubt, he will renounce Thee to Thy face!' (Job i. 10, 11) However, that cursed one gained no advantage; and God forbid he should gain any advantage of us either; but whenever we are either in penury, or in sicknesses, or in disasters, then let us increase our thanksgiving; thanksgiving, I mean, not in words, nor in tongue, but in deeds and works, in mind and in heart. Let us give thanks unto Him with all our souls. For He loves us more than our parents; and wide as is the difference between evil and goodness, so great is the difference between the love of God and that of our fathers." (John Chrysostom, Homilies on Ephesians, 19)