John 3:5
The first creation then, that of Adam, was from earth; the next, that of the woman, from his rib; the next, that of Abel, from seed; yet we cannot arrive at the comprehension of any one of these, nor prove the circumstances by argument, though they are of a most earthly nature; how then shall we be able to give account of the unseen generation by Baptism, which is far more exalted than these, or to require arguments for that strange and marvelous Birth? Since even Angels stand by while that Generation takes place, but they could not tell the manner of that marvelous working, they stand by only, not performing anything, but beholding what takes place. The Father, the Son, and the Holy Ghost, works all. Let us then believe the declaration of God; that is more trustworthy than actual seeing. The sight often is in error, it is impossible that God's Word should fail; let us then believe it; that which called the things that were not into existence may well be trusted when it speaks of their nature. What then says it? That what is effected is a Generation. If any ask, “How,” stop his mouth with the declaration of God, which is the strongest and a plain proof. If any enquire, “Why is water included?” let us also in return ask, “Wherefore was earth employed at the beginning in the creation of man?” for that it was possible for God to make man without earth, is quite plain to every one. Be not then over-curious.
That the need of water is absolute and indispensable, you may learn in this way. On one occasion, when the Spirit had flown down before the water was applied, the Apostle did not stay at this point, but, as though the water were necessary and not superfluous, observe what he says; “Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we?”
What then is the use of the water? This too I will tell you hereafter, when I reveal to you the hidden mystery. There are also other points of mystical teaching connected with the matter, but for the present I will mention to you one out of many. What is this one? In Baptism are fulfilled the pledges of our covenant with God; burial and death, resurrection and life; and these take place all at once. For when we immerse our heads in the water, the old man is buried as in a tomb below, and wholly sunk forever; then as we raise them again, the new man rises in its stead. As it is easy for us to dip and to lift our heads again, so it is easy for God to bury the old man, and to show forth the new. And this is done thrice, that you may learn that the power of the Father, the Son, and the Holy Ghost fulfills all this. To show that what we say is no conjecture, hear Paul saying, “We are buried with Him by Baptism into death”: and again, “Our old man is crucified with Him”: and again, “We have been planted together in the likeness of His death.” And not only is Baptism called a “cross,” but the “cross” is called “Baptism.” “With the Baptism,” says Christ, “that I am baptized withal shall you be baptized”: and, “I have a Baptism to be baptized with” (which you know not); for as we easily dip and lift our heads again, so He also easily died and rose again when He willed or rather much more easily, though He tarried the three days for the dispensation of a certain mystery.
3. Let us then who have been deemed worthy of such mysteries show forth a life worthy of the Gift, that is, a most excellent conversation; and do ye who have not yet been deemed worthy, do all things that you may be so, that we may be one body, that we may be brethren. For as long as we are divided in this respect, though a man be father, or son, or brother, or anything else, he is no true kinsman, as being cut off from that relationship which is from above. What advantages it to be bound by the ties of earthly family, if we are not joined by those of the spiritual? What profits nearness of kin on earth, if we are to be strangers in heaven? For the Catechumen is a stranger to the Faithful. He has not the same Head, he has not the same Father, he has not the same City, nor Food, nor Raiment, nor Table, nor House, but all are different; all are on earth to the former, to the latter all are in heaven. One has Christ for his King; the other, sin and the devil; the food of one is Christ, of the other, that meat which decays and perishes; one has worms' work for his raiment, the other the Lord of angels; heaven is the city of one, earth of the other. Since then we have nothing in common, in what, tell me, shall we hold communion? Did we remove the same pangs, did we come forth from the same womb? This has nothing to do with that most perfect relationship. Let us then give diligence that we may become citizens of the city which is above. How long do we tarry over the border, when we ought to reclaim our ancient country? We risk no common danger; for if it should come to pass, (which God forbid!) that through the sudden arrival of death we depart hence uninitiated, though we have ten thousand virtues, our portion will be no other than hell, and the venomous worm, and fire unquenchable, and bonds indissoluble. But God grant that none of those who hear these words experience that punishment! And this will be, if having been deemed worthy of the sacred mysteries, we build upon that foundation gold, and silver, and precious stones; for so after our departure hence we shall be able to appear in that place rich, when we leave not our riches here, but transport them to inviolable treasuries by the hands of the poor, when we lend to Christ. Many are our debts there, not of money, but of sins; let us then lend Him our riches, that we may receive pardon for our sins; for He it is that judges. Let us not neglect Him here when He hungers, that He may ever feed us there. Here let us clothe Him, that He leave us not bare of the safety which is from Him. If here we give Him drink, we shall not with the rich man say, “Send Lazarus, that with the tip of his finger he may drop water on my broiling tongue.” If here we receive Him into our house, there He will prepare many mansions for us; if we go to Him in prison, He too will free us from our bonds; if we take Him in when He is a stranger, He will not suffer us to be strangers to the Kingdom of heaven, but will give us a portion in the City which is above; if we visit Him when He is sick, He also will quickly deliver us from our infirmities.
Let us then, as receiving great things though we give but little, still give the little that we may gain the great. While it is yet time, let us sow, that we may reap. When the winter overtakes us, when the sea is no longer navigable, we are no longer masters of this traffic. But when shall the winter be? When that great and manifest Day is at hand. Then we shall cease to sail this great and broad sea, for such the present life resembles. Now is the time of sowing, then of harvest and of gain. If a man puts not in his seed at seed time and sows in harvest, besides that he effects nothing, he will be ridiculous. But if the present is seed time, it follows that it is a time not for gathering together, but for scattering; let us then scatter, that we may gather in, and not seek to gather in now, lest we lose our harvest; for, as I said, this season summons us to sow, and spend, and lay out, not to collect and lay by. Let us not then give up the opportunity, but let us put in abundant seed, and spare none of our stores, that we may receive them again with abundant recompense, through the grace and lovingkindness of our Lord Jesus Christ, with whom to the Father and the Holy Ghost be glory, world without end. Amen.
Source: Homilies on the Gospel of John (New Advent)