6 Nevertheless, after so many and so grave words, we take thought for these things, but for the things in Heaven no longer: rather we have reversed His order, on either side fighting against His sayings. For mark; “Seek ye not the things present,” says He, “at all;” but we are seeking these things for ever: “seek the things in Heaven,” says He; but those things we seek not so much as for a short hour, but according to the greatness of the anxiety we display about the things of the world, is the carelessness we entertain in things spiritual; or rather even much greater. But this does not prosper for ever; neither can this be for ever. What if for ten days we think scorn? If for twenty? If for an hundred? Must we not of absolute necessity depart, and fall into the hands of the Judge?
“But the delay has comfort.” And what sort of comfort, to be every day looking for punishment and vengeance? Nay, if you would have some comfort from this delay, take it by gathering for yourself the fruit of amendment after repentance. Since if the mere delay of vengeance seem to you a sort of refreshment, far more is it gain not to fall into the vengeance. Let us then make full use of this delay, in order to have a full deliverance from the dangers that press upon us. For none of the things enjoined is either burdensome or grievous, but all are so light and easy, that if we only bring a genuine purpose of heart, we may accomplish all, though we be chargeable with countless offenses. For so Manasses had perpetrated innumerable pollutions, having both stretched out his hands against the saints, and brought abominations into the temple, and filled the city with murders, and wrought many other things beyond excuse; yet nevertheless after so long and so great wickedness, he washed away from himself all these things. How and in what manner? By repentance, and consideration.
For there is not, yea, there is not any sin, that does not yield and give way to the power of repentance, or rather to the grace of Christ. Since if we would but only change, we have Him to assist us. And if you are desirous to become good, there is none to hinder us; or rather there is one to hinder us, the devil, yet has he no power, so long as you choose what is best, and so attract God to your aid. But if you are not yourself willing, but startest aside, how shall He protect you? Since not of necessity or compulsion, but of your own will, He wills you to be saved. For if you yourself, having a servant full of hatred and aversion for you, and continually going off, and fleeing away from you, wouldest not choose to keep him, and this though needing his services; much less will God, who does all things not for His own profit, but for your salvation, choose to retain you by compulsion; as on the other hand, if you show forth a right intention only, He would not choose ever to give you up, no, not whatever the devil may do. So that we are ourselves to blame for our own destruction. Because we do not approach, nor beseech, nor entreat Him, as we ought: but even if we do draw near, it is not as persons who have need to receive, neither is it with the proper faith, nor as making demand, but we do all in a gaping and listless way.
Source: Homilies on the Gospel of St. Matthew (New Advent)