9 Why then was it the will of the Lord, seeing that the Spirit's benefits in us are the greatest, because by Him the love of God is shed abroad in our hearts, to give us that Spirit after His resurrection? Why did He signify by this? In order that in our resurrection our love may be inflamed, and may part from the love of the world to run wholly towards God. For here we are born and die: let us not love this world; let us migrate hence by love; by love let us dwell above, by that love by which we love God.
In this sojourn of our life let us meditate on nothing else, but that here we shall not always be, and that by good living we shall prepare a place for ourselves there, whence we shall never migrate. For our Lord Jesus Christ, after that He is risen again, “now dies no more;” “death,” as the apostle says, “shall no more have dominion over Him.” Behold what we must love. If we live, if we believe in Him who is risen again, He will give us, not that which men love here who love not God, or love the more the less they love Him, but love this the less the more they love Him; but let us see what He has promised us.
Not earthly and temporal riches, not honors and power in this world; for you see all these things given to wicked men, that they may not be highly prized by the good. Not, in short, bodily health itself, though it is He that gives that also, but that, as you see, He gives even to the beasts. Not long life; for what, indeed, is long that will some day have an end? It is not length of days that He has promised to His believers, as if that were a great thing, or decrepit old age, which all wish for before it comes, and all murmur at when it does come.
Not beauty of person, which either bodily disease or that same old age which is desired drives away. One wishes to be beautiful, and also to live to be old: these two desires cannot agree together; if you shall be old, you will not be beautiful; when old age comes, beauty will flee away; the vigor of beauty and the groaning of old age cannot dwell together in one body. All these things, then, are not what He promised us when He said, “He that believes in me, let him come and drink, and out of his belly shall flow rivers of living water.”
He has promised us eternal life, where we shall have no fear, where we shall not be troubled, whence we shall have no migration, where we shall not die; where there is neither bewailing a predecessor deceased, nor a hoping for a successor. Accordingly, because such is what He has promised to us that love Him, and glow with the charity of the Holy Spirit, therefore He would not give us that same Spirit until He should be glorified, so that He might show in His body the life which we have not now, but which we hope for in the resurrection.
Source: Tractates on the Gospel of John (New Advent)