The text below is from a treatise on the Holy Spirit by St. Basil the Great (330-379 AD)
For this cause the Lord, who gives us our life, gave us the covenant of baptism, containing a type of life and death, for the water fulfils the image of death, and the Spirit gives us the promise of life. Hence it follows that the answer to our question why the water was associated with the Spirit is clear. The reason is because in baptism two ends were proposed: on the one hand, the destroying of the body of sin, that it may never ripen into death; on the other hand, our coming to life in the Spirit, ripening and having our fruit in holiness. Like a tomb, the water receives the body, symbolizing death; while the Spirit pours in the quickening power, renewing our souls from the deadness of sin into their original life. This then is what it is to be born again of water and of the Spirit, the water bringing the necessary death while the Spirit creates life within us.
In three immersions, then, and with three invocations, the great mystery of baptism is performed. Thus the symbol of death is made complete, and by the passing on of the divine knowledge the baptized have their souls enlightened. It follows that if there is any grace in the water, it is not of the nature of the water, but of the presence of the Spirit. For baptism is not the putting away of the filth of the flesh, but the answer of a good conscience towards God. So in training us for the life that follows on the resurrection the Lord sets out all the manner of life required by the Gospel, laying down for us the law of gentleness, of endurance of wrong, of freedom from the defilement that comes of the love of pleasure, and from covetousness – all this so that we can by our own choice achieve all that the life to come of its inherent nature possesses.
Through the Holy Spirit comes our restoration to paradise, our ascension into the kingdom of heaven, our return to the status of adopted sons, our liberty to call God our Father, our being made partakers of the grace of Christ, our being called children of light, our sharing in eternal glory – in a word, our being brought into a state of all fullness of blessing both in this world and in the world to come, of all the good gifts that are in store for us. Through faith we behold the reflection of their grace as though they were already present, but we still have to wait for the full enjoyment of them. If such is the promise, what will the perfection be like? If these are the first fruits, what will be the complete fulfilment?