Therefore let all mouths render praise to Him Who has removed from them blasphemous speech. Glory to You Who departed from one dwelling to take up your abode in another! That He might come and make us a dwelling-place for His Sender, the only-begotten departed from [being] with Deity and took up His abode in the Virgin; that by a common manner of birth, though only-begotten, He might become the brother of many. And He departed from Sheol and took up His abode in the Kingdom; that He might seek out a path from Sheol which oppresses all, to the Kingdom which requites all.
For our Lord gave His resurrection as a pledge to mortals, that He would remove them from Sheol, which receives the departed without distinction, to the Kingdom which admits the invited with distinction; so that, from [the plan] which makes equal the bodies of all men within it, we may come to [the plan] which distinguishes the works of all men within it. This is He Who descended to Sheol and ascended, that from [the place] which corrupts its sojourners, He might bring us to the place which nourishes with its blessings its dwellers; even those dwellers who, with the possessions, the fruits, and the flowers, of this world, that pass away, have crowned and adorned for themselves there, tabernacles that pass not away.
That Firstborn Who was begotten according to His nature, was born in another birth that was external to His nature; that we might know that after our natural birth we must have another birth which is outside our nature. For He, since He was spiritual, until He came to the corporeal birth, could not be corporeal; in like manner also the corporeal, unless they are born in another birth, cannot be spiritual. But the Son Whose generation is unsearchable, was born in another generation that may be searched out; that by the one we might learn that His Majesty is without limit, and by the other might be taught that His grace is without measure.
For great is His Majesty without measure, Whose first generation cannot be imagined in any of our thoughts. And His grace is abundant without limit, Whose second birth is proclaimed by all mouths.
Source: On Our Lord (New Advent)