8 But a Christian ought not to be wealthy, but ought to acknowledge himself poor; and if he has riches, he ought to know that they are not true riches, so that he may desire others...And what is the wealth of our righteousness? How much soever righteousness there may be in us, it is a sort of dew compared to that fountain: compared to that plenteousness it is as a few drops, which may soften our life, and relax our hard iniquity. Let us only desire to be filled with the full fountain of righteousness, let us long to be filled with that abundant richness, of which it is said in the Psalm, “They shall be satisfied with the plenteousness of Your house: and You shall give them drink out of the torrent of Your pleasure.” But while we are here, let us understand ourselves to be destitute and in want; not only in respect of those riches which are not the true riches, but of salvation itself.
And when we are whole, let us understand that we are weak. For as long as this body hungers and thirsts, as long as this body is weary with watching, weary with standing, weary with walking, weary with sitting, weary with eating; wherever it turns itself for a relief from weariness, there it discovers another source of fatigue: there is therefore no perfect soundness, not even in the body itself. Those riches are then not riches, but beggary; for the more they abound, the more does destitution and avarice increase...Let then our whole hunger, our whole thirst, be for true riches, and true health, and true righteousness.
What are true riches? That heavenly abode in Jerusalem. For who is called rich on this earth? When a rich man is praised, what is meant? He is very rich: nothing is wanting to him. That surely is the praise of him that praises the other: for it is not this, when it is said, He wants nothing. Consider if he really want nothing. If he desires nothing, he wants nothing: but if he still desires more than what he has, his riches have increased in such wise, that his wants have increased also. But in that City there will be true riches, because there will be nothing wanting to us there; for we shall not be in need of anything, and there will be true health...
Source: The Enarrations, or Expositions, on the Psalms (New Advent)