2 With the eyes of faith you have seen this man blind, you have seen him too of blind seeing; but you have heard him erring. Wherein this blind man erred, I will tell you; first, in that he thought Christ a prophet, and knew not that He was the Son of God. And then we have heard an answer of his entirely false; for he said, “We know that God hears not sinners.” If God hears not sinners, what hope have we? If God hears not sinners, why do we pray, and publish the record of our sin by the beating of the breast?
Where again is that Publican, who went up with the Pharisee into the temple and while the Pharisee was boasting, parading his own merits, he standing afar off, and with his eyes fastened on the ground, and beating his breast, was confessing his sins? And this man, who confessed his sins, went down from the temple justified rather than the other Pharisee. Assuredly then God does hear sinners. But he who spoke these words had not yet washed the face of the heart in Siloa. The sacrament had gone before on his eyes; but in the heart had not been yet effected the blessing of the grace.
When did this blind man wash the face of his heart? When the Lord admitted him into Himself after he had been cast out by the Jews. For He found him, and said to him as we have heard; “Do you believe in the Son of God?” And he, “Who is He, Lord, that I may believe in Him?” With the eyes, it is true, he saw already; did he see already in the heart? No, not yet. Wait; he will see presently. Jesus answered him, “I that speak with you am He.” Did he doubt? No, immediately he washed his face. For he was speaking with That Siloa, “which is by interpretation, Sent.” Who is the Sent, but Christ? Who often bore witness, saying, “I do the will of My Father That sent Me.” He then was Himself the Siloa. The man approached blind in heart, he heard, believed, adored; washed the face, saw.
Source: Sermons on Selected Lessons of the New Testament (New Advent)