6 “There have been troubled all the unwise in heart”....How have they been troubled? When the Gospel is preached. And what is life eternal? And who is He that has risen from the dead? The Athenians wondered, when the Apostle Paul spoke of the resurrection of the dead, and thought that he spoke but fables. But because he said that there was another life which neither eye has seen, nor ear heard, nor has it gone up into the heart of man, therefore the unwise in heart were troubled.
But what has befallen them? “They have slept their sleep, and all men of riches have found nothing in their hands.” They have loved things present, and have gone to sleep in the midst of things present: and so these very present things have become to them delightful: just as he that sees in a dream himself to have found treasure, is so long rich as he wakes not. The dream has made him rich, waking has made him poor. Sleep perchance has held him slumbering on the earth, and lying on the hard ground, poor and perchance a beggar; in sleep he has seen himself to lie on an ivory or golden bed, and on feathers heaped up; so long as he is sleeping, he is sleeping well, waking he has found himself on the hard ground, whereon sleep had taken him.
Such men also are these too: they have come into this life, and through temporal desires, they have as it were slumbered here; and them riches, and vain pomps that fly away, have taken, and they have passed away: they have not understood how much of good might be done therewith. For if they had known of another life, there they would have laid up unto themselves the treasure which here was doomed to perish: like as Zacchæus, the chief of the Publicans, saw that good when he received the Lord Jesus in his house, and he says, “The half of my goods I give to the poor, and if to any man I have done any wrong, fourfold I restore.” This man was not in the emptiness of men dreaming, but in the faith of men awake....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)