17 What follows? If “there shall be praised all men right in heart,” there shall be condemned the crooked in heart. Two things are set before you now, choose while there is time....If of crooked heart you have become, there will come that Judgment, there will appear all the reasons on account of which God does all these things: and you that would not in this life correct your heart by the rectitude of God, and prepare yourself for the right hand, where “there shall be praised all men right in heart,” will be on the left, where at that time you shall hear, “Go ye into fire everlasting, that has been prepared for the devil and his angels.” And will there be then time to correct the heart?
Now therefore correct, brethren, now correct. Who does hinder? Psalm is chanted, Gospel is read, Reader cries, Preacher cries; long-suffering is the Lord; you sin, and He spares; still you sin, still He spares, and still you add sin to sin. How long is God long-suffering? You will find God just also. We terrify because we fear; teach us not to fear, and we terrify no more. But better it is that God teach us to fear, than that any man teach us not to fear.... You bring forth grain, barn expect thou; bringest forth thorns, fire expect thou.
But not yet has come either the time of the barn or the time of the fire: now let there be preparation, and there will not be fear. In the name of Christ both we who speak are living, and you to whom we speak are living: for amending our plan, and changing evil life into a good life, is there no place, is there no time? Can it not, if you will, be done today? Can it not, if you will, be now done? What must you buy in order to do it, what specifics must you seek? To what Indies must you sail? What ship prepare? Lo, while I am speaking, change the heart; and there is done what so often and so long while is cried out for, that it be done, and which brings forth everlasting punishment if it be not done.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)