7 Let us not then be deceived, neither let us by every mean seek after the life of ease. For “whom the Lord loves,” it is said, “He chastens.” Wherefore when we enjoy prosperity, living in wickedness, then most of all should we grieve. For we ought ever to be afraid while we sin, but especially when we suffer no ill. For when God exacts our penalties little by little, he makes our payment for these things easy to us; but when he is long-suffering for each of our negligences, He is storing us up, if we continue in such things, unto a great punishment. Since, if for the well-doers affliction be a necessary thing, much more for them that sin.
See for instance how much long-suffering Pharaoh met with, and afterwards underwent for all most extreme punishment: in how many things Nebuchadnezzar offended, yet at the end expiated all; and the rich man, because he had suffered no great ill here, for this very cause chiefly became miserable, for that having lived in luxury in the present life, he departed to pay the penalty of all these things there, where he could not obtain anything at all to soothe his calamity.
Yet for all this some are so cold and senseless, as to be always seeking only the things that are here, and uttering those absurd sayings, “Let me enjoy all things present for a time, and then I will consider about things out of sight: I will gratify my belly, I will be a slave to pleasures, I will make full use of the present life; give me today, and take tomorrow.” Oh excess of folly! Why, wherein do they who talk so differ from goats and swine? For if the prophet permits not them to be accounted men, that “neigh after their neighbors wife,” who shall blame us for esteeming these to be goats and swine, and more insensible than asses, by whom those things are held uncertain, which are more evident than what we see? Why, if you believe nothing else, attend to the devils in their scourging, to them who had our hurt for their object in all their practice, both in word and deed. For you will not, I am sure, contradict this, that they do all to increase our security, and to do away with the fear of hell, and to breed disbelief of the tribunals in that world. Nevertheless, they that are so minded, by cryings and wailings do oftentimes proclaim the torments that are there. Whence is it then that they so speak, and utter things contrary to their own will? From no other cause, but because they are under the pressure of stronger compulsion. For they would have not been minded of their own accord to confess either that they are tormented by dead men, or that they at all suffer anything dreadful.
Wherefore now have I said this? Because evil demons confess hell, who would fain have hell disbelieved; but you who enjoyest honor so great, and hast been a partaker in unutterable mysteries, dost not so much as imitate them, but art become more hardened even than they.
Source: Homilies on the Gospel of St. Matthew (New Advent)