And yet the material of Baptism is said to be natural water. Baptism has no validity and efficacy if it is not performed with water. Thus the natural quality of water has in itself value and significance, since the supernatural effect of baptism is associated in a supernatural manner with water only, and not with any other material. God, by means of his omnipotence, could have united the same effect to anything whatever. But he does not; he accommodates himself to natural qualities; he chooses an element corresponding, analogous to his operation. Thus the natural is not altogether set aside; on the contrary, there always remains a certain analogy with the natural, an appearance of naturalness. In like manner wine represents blood; bread, flesh. [180] Even miracle is guided by analogies; water is changed into wine or blood, one species into another, with the retention of the indeterminate generic idea of liquidity. So it is here. Water is the purest, clearest of liquids; in virtue of this its natural character it is the image of the spotless nature of the Divine Spirit. In short, water has a significance in itself, as water; it is on account of its natural quality that it is consecrated and selected as the vehicle of the Holy Spirit. So far there lies at the foundation of Baptism a beautiful, profound natural significance. But, at the very same time, this beautiful meaning is lost again because water has a transcendental effect,--an effect which it has only through the supernatural power of the Holy Spirit, and not through itself. The natural quality becomes indifferent: he who makes wine out of water, can at will unite the effects of baptismal water with any material whatsoever. Baptism cannot be understood without the idea of miracle. Baptism is itself a miracle. The same power which works miracles, and by means of them, as a proof of the divinity of Christ, turns Jews and Pagans into Christians,--this same power has instituted baptism and operates in it. Christianity began with miracles, and it carries itself forward with miracles. If the miraculous power of baptism is denied, miracles in general must be denied. The miracle-working water of baptism springs from the same source as the water which at the wedding at Cana in Galilee was turned into wine.