3 But they who cast him out continued blind, forasmuch as they cavilled at the Lord, that it was the sabbath when He made clay of the spittle, and anointed the eyes of the blind man. For when the Lord cured with a word, the Jews openly cavilled. For He did no work on the sabbath day, when He spoke, and it was done. It was a manifest cavil; they cavilled at Him merely commanding, they cavilled at Him speaking; as if they did not themselves speak all the sabbath day. I might say that they do not speak not only on the sabbath, but on no day, forasmuch as they have kept back from the praises of the True God.
Nevertheless, as I have said, brethren, it was a manifest cavil. The Lord said to a certain man, “Stretch forth your hand;” he was made whole, and they cavilled for that He healed on the sabbath day. What did He do? What work did He do? What burden did He bear? But in this instance, the spitting on the ground, the making clay, and anointing the man's eyes, is doing some work. Let no one doubt it, it was doing a work. The Lord did break the sabbath; but was not therefore guilty.
What is that I have said, “He broke the sabbath”? He, the Light had come, He was removing the shadows. For the sabbath was enjoined by the Lord God, enjoined by Christ Himself, who was with the Father, when that Law was given; it was enjoined by Him, but in shadow of what was to come. “Let no man therefore judge you in meat, or in drink, or in respect of an holy day, or of the new moon, or of the sabbath days, which are a shadow of things to come.” He had now come whose coming these things announced.
Why do the shadows delight us? Open your eyes, you Jews; the Sun is present. “We know.” What do ye know, you blind in heart? What know ye? “That this man is not of God, because he thus breaks the sabbath day.” The sabbath, unhappy men, this very sabbath did Christ ordain, who you say is not of God. You observe the sabbath in a carnal manner, you have not the spittle of Christ. In this earth of the sabbath look also for the spittle of Christ, and you will understand that by the sabbath Christ was prophesied.
But you, because you have not the spittle of Christ in the earth upon your eyes, you have not come unto Siloa, and have not washed the face, and have continued blind, blind to the good of this blind man, yea now no longer blind either in body or heart. He received clay with the spittle, his eyes were anointed, he came to Siloa, he washed his face, he believed on Christ, he saw, he continued not in that exceedingly fearful judgment; “For judgment I came into this world, that they which see not may see, and that they which see may be made blind.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)