32 “The children of Your servants shall dwell there: and their seed shall stand fast for ages”: for the age of ages, the age of eternity, the age that abides. But, “the children,” he says, “of Your servants:” is it to be feared lest we be the servants of God, and our children, and not ourselves, dwell there? Or if we are the children of the servants, inasmuch as we are the Apostles' children, what are we to say? Can those children rising after have so unhappy a presumption, as to boast in their late succession, and so to venture to say, We shall be there; the Apostles will not be there?
May this be far from their piety as children, from their faith as little ones, from their understanding when of age! The Apostles also will be there: rams go before, lambs follow. Wherefore then, “the children of Your servants;” and not in brief, “Your servants”? Both they are Your servants, and their children are Your servants; and the children of these, their grandsons, what are they but Your servants? You would include them all briefly, if You should say, Your servants shall dwell therein....“The children of Your servants,” are the works of Your servants; no one shall dwell there, but through his own works.
What therefore means, Their children shall dwell? Let no man boast that he shall dwell there, if he calls himself God's servant, and has not works; for none but children shall dwell there. What means therefore, “The children of Your servants shall dwell there”? Your servants shall dwell there by their own works, Your servants shall dwell there through their own children. Be not therefore barren, if you dost wish to dwell there; send before the children whom you may follow, by sending them before you, not by burying them. Let your children lead you to the land of promise, the land of the living, not of the dying: while you are living here in this pilgrimage, let them go before you, let them receive you....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)