14 Let us then be obedient to His sayings; let us not oppose ourselves, nor be contentious; for first of all, even antecedently to their rewards, these injunctions have their pleasure and profit in themselves. And if to the more part they seem to be burdensome, and the trouble which they cause, great; have it in your mind that you are doing it for Christ's sake, and the pain will be pleasant. For if we maintain this way of reckoning at all times, we shall experience nothing burdensome, but great will be the pleasure we reap from every quarter; for our toil will no longer seem toil, but by how much it is enhanced, so much the sweeter and pleasanter does it grow.
When therefore the custom of evil things, and the desire of wealth, keep on bewitching you; do thou war against them with that mode of thinking which tells us, “Great is the reward we shall receive, for despising the pleasure which is but for a season;” and say to your soul; “Are you quite dejected because I defraud you of pleasure? Nay, be of good cheer, for I am introducing you into Heaven. You do it not for man's sake, but for God's. Be patient therefore a little while, and you shall see how great is the gain. Endure for the present life, and you shall receive an unspeakable confidence.” For if we would thus discourse with our own soul, and not only consider that which is burdensome in virtue, but take account also of the crown that comes thereof, we shall quickly withdraw it from all wickedness.
For if the devil, holding out pleasure for a season, but pain for ever, is yet strong, and prevails; seeing our case is just the reverse in these matters, the labor temporary, the pleasure and profit immortal, what plea shall we have, if we follow not virtue after so great encouragement? Why, the object of our labors is enough to set against all, and our clear persuasion that for God's sake we are enduring all this. For if one having the king his debtor, thinks he has sufficient security for all his life; consider how great will he be, who has made the Gracious and Everlasting God a debtor to himself, for good deeds both small and great. Do not then allege to me labors and sweats; for not by the hope only of the things to come, but in another way also, God has made virtue easy, assisting us everywhere, and putting His hand to our work. And if you will only contribute a little zeal, everything else follows. For to this end He will have you too to labor a little, even that the victory may be yours also. And just as a king would have his own son present indeed in the array; he would have him shoot with the bow, and show himself, that the trophy may be reckoned his, while he achieves it all Himself: even so does God in our war against the devil: He requires of you one thing alone, that you show forth a sincere hatred against that foe. And if you contribute this to Him, He by Himself brings all the war to an end. Though thou burn with anger, with desire of riches, with any tyrannical passion whatever; if He see you only stripping yourself and prepared against it, He comes quickly to you, and makes all things easy, and sets you above the flame, as He did those children of old in the Babylonian furnace: for they too carried in with them nought but their good will.
In order then that we also may extinguish all the furnace of disordered pleasure here, and so escape the hell that is there, let these each day be our counsels, our cares, and our practice, drawing towards us the favor of God, both by our full purpose concerning good works, and by our frequent prayers. For thus even those things which appear insupportable now, will be most easy, and light, and lovely. Because, so long as we are in our passions, we think virtue rugged and morose and arduous, vice desirable and most pleasing; but if we would stand off from these but a little, then both vice will appear abominable and unsightly, and virtue easy, mild, and much to be desired. And this you may learn plainly from those who have done well. Hear, for instance, how of those passions Paul is ashamed, even after his deliverance from them, saying, “For what fruit had ye then in those things, whereof you are now ashamed?” But virtue, even after his labor, he affirms to be light, calling the laboriousness of our affliction momentary and “light,” and rejoicing in his sufferings, and glorying in his tribulations, and taking a pride in the marks wherewith he had been branded for Christ's sake.
In order then that we too may establish ourselves in this habit, let us order ourselves each day by what has been said, and “forgetting those things which are behind, and reaching forth unto those things which are before, let us press on towards the prize of the high calling:” unto which God grant that we may all attain, by the grace and love towards man of our Lord Jesus Christ, to whom be glory and power for ever and ever. Amen.
Source: Homilies on the Gospel of St. Matthew (New Advent)