10 “But how long is the sinner to flourish? How long shall I have to endure?” You are impatient; that which seems long to you, will soon come to pass. It is infirmity makes that seem long, which is really short, as is found in the case of the longings of sick men. Nothing seems so long as the mixing of the potion for him when thirsty. For all that his attendants are making all speed, lest haply the patient be angry; “When will it be done? (he cries). When will it be drest? When will it be served?” Those who are waiting upon you are making haste, but your infirmity fancies that long which is being done with expedition. Behold ye, therefore, our Physician complying with the infirmity of the patient, saying, “How long shall I have to endure? How long will it be?”
“Yet a little while, and the sinner shall not be”. Is it certainly among sinners, and because of the sinner, that you murmur. “A little while, and he shall not be.” Lest haply because I said, “They that wait upon the Lord, they shall inherit the land,” you should think that waiting to be of very long duration. Wait “a little while,” you shall receive without end what you wait for. A little while, a moderate space. Review the years from Adam's time up to this day; run through the Scriptures. It is almost yesterday that he fell from Paradise! So many ages have been measured out, and unrolled. Where now are the past ages? Even so, however, shall the few which remain, pass away also. Had you been living throughout all that time, since Adam was banished from Paradise up to this present day, you would certainly see that the life, which had thus flown away, had not been of long duration. But how long is the duration of each individual's life? Add any number of years you please: prolong old age to its longest duration: what is it? Is it not but a morning breeze? Be it so, however, that the Day of Judgment is far off, when the reward of the righteous and of the unrighteous is to come: your last day at all events cannot be far off. Make yourself ready against this! For such as you shall have departed from this life, shall you be restored to the other. At the close of that short life, you will not yet be, where the Saints shall be, to whom it shall be said, “Come, you blessed of My Father: inherit the kingdom prepared for you from the beginning of the world.” You will not yet be there? Who does not know that? But you may already be there, where that beggar, once “covered with sores,” was seen at a distance, at rest, by that proud and unfruitful “rich man” in the midst of his torments. Surely hid in that rest you wait in security for the Day of Judgment, when you are to receive again a body, to be changed so as to be made equal to an Angel. How long then is that for which we are impatient, and are saying, “When will it come? Will it tarry long?” This our sons will say hereafter, and our sons' sons will say too; and, though each one of these in succession will say this same thing, that “little while” that is yet to be, passes away, as all that is already past has passed away already! O thou sick one! “Yet a little while, and the sinner shall not be. Yea, you shall diligently consider his place, and you shall not find him.”...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)