Sermon by St. Augustine the Bishop
By these words of the Lord: I will pray the Father, and he shall give you another Comforter: he certainly doth imply that he himself is a comforter. The Greek word used, namely, Paraclete, signifieth also an advocate, and is used in that sense where it is written: We have an Advocate with the Father, Jesus Christ the Righteous. The Gospel continueth with the words: Even the Spirit of Truth, whom the world cannot receive: concerning which the Apostle saith: The carnal mind is enmity against God; for it is not subject to the law of God, neither indeed can it be. Which is as though to say: Nothing can make unrighteousness righteous. By the word World, in this place, we must understand the lovers of the world, a love which cometh not of the Father. And therefore it is that this love of the world, which we strive to lessen and to destroy in ourselves, is contrary to the love of God, which is shed abroad in our hearts by the Holy Ghost which is given unto us.
The world cannot receive him, because it seeth him not, neither knoweth him. For to love the world is to lack those spiritual eyes, which are able to see him who is invisible, namely, the Holy Ghost. But, saith the Lord to his disciples: Ye know him, for he dwelleth with you, and shall be in you. That is, He cometh to dwell with you, so that he may be in you abidingly. The Lord did not mean that the Spirit would come to dwell for a while, and so be in his people only for a season. According to this latter sense of the verb To Be, one must first be in a place before one can dwell there. So, lest the Apostles should think that the words: He shall dwell with you: signified that he should visibly abide with them for a while, as do guests in the houses of men, the Lord added in explanation: He shall be in you: which is to say: He shall abide in you.
On this wise, then, is he seen that is invisible: If he were not in us we could have in us no knowledge of him; but he is seen in us, as we see our consciences. We see the faces of other men, and we cannot see our own; but of men's consciences we see none save that which is within ourselves. However, our conscience is never elsewhere except within us; whereas the Holy Ghost may be outside of us, as well as within us. He is given to be within us, and unless he be within us, we can neither see nor know him, either within us or outside of us. Then, after the Lord had promised the Holy Ghost (lest anyone should fancy that he intended to give them this Comforter in place of himself, and he himself was to be no longer with them, but leave them as orphans), he said also: I will not leave you comfortless; I will come to you. Therefore, although the Son of God hath made us by adoption sons of his own Father, and hath willed that the Same who is his Father by nature should be our Father by grace, nevertheless, he sheweth that he himself hath towards us a love as of a father, whereof he saith: I will not leave you comfortless, that is, orphans.