His parents answered them and said, We know that this is our son, and that he was born blind:
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Cyril of Alexandria
They acknowledge as true that which was in no wise doubtful and for which it was hardly likely they would suffer anything disagreeable; for they say that they recognise their own offspring, and do not deny what really was the case at his birth, but distinctly affirm that he was born with the affliction. Nevertheless they shrink from relating the miracle, leaving the nature of the deed to speak for itself, and maintaining that it would be much more suitable to put the question as to how he had been healed to their son himself. Fear of danger is certainly a powerful motive to turn men aside from what it befits them to do. Being greatly alarmed by the harshness of the Pharisees, they do not observe that which is somewhere well said: Strive for the truth unto death. It is likely that they did suffer something of another sort; for the poor man is always timid, and, losing through, his poverty the power to offer bold resistance, often takes refuge in an unwilling silence, and a forced acquie...
The Pharisees had put three questions to the parents of the blind man: “Is he your son? Was he born blind? And how did he gain his sight?” To the first two they assert: “He is our son, and he was born blind.” Concerning how he was healed they are silent, because they do not know. Without doubt this took place for the greater confirmation of the truth; for the man who received the benefit of the miracle, and was the most credible of all the witnesses, said exactly the same. Then the parents add, “He is of age; he is not an infant, or so immature as not to understand how he was healed.” These words spake his parents, because they feared the Jews. They were still weak in faith and more faint-hearted than their son, who proved to be a steadfast witness to the truth. As a reward, God also illumined the eyes of his mind.