I Found The Thief
The disciples faced a theological problem. Believing that sin directly caused all suffering, how could a person be born with a handicap? Therefore either this man … sinned in his mother’s womb (Ezek. 18:4) or his parents sinned (Ex. 20:5). Jesus therefore answered, Neither this man nor his parents sinned. These words do not contradict the universal sinfulness of man (cf. Rom. 3:9–20, 23). Instead Jesus meant that this man’s blindness was not caused by some specific sin. Instead the problem existed so that … God could display His glory in the midst of seeming tragedy
Addressing these Pharisees, Jesus said: anyone who does not enter the sheepfold by the gate, but climbs in by some other way, is a thief and a robber. He implies that, far from being true shepherds of Israel, they are thieves and robbers who do not care for the sheep, something all too evident in their treatment of the man born blind.
All who have come before me are thieves and robbers. There may be an allusion here to Old Testament passages such as Jeremiah 23:1–8 and Ezekiel 34 in which these prophets pronounced judgment upon the shepherds of Israel for their failure to care for the people. Jesus may also have had in mind messianic pretenders (cf. Matt. 24:24; Mark 13:22), but most likely he was referring to those who had treated the man born blind so badly. Of such leaders Jesus said, the sheep have not listened to them. The man born blind certainly did not listen to them. Those who belong to Jesus, the true shepherd, do not respond to voices such as theirs.
Jesus added: The thief comes only to steal and kill and destroy. He depicted those Pharisees as sheep-stealers who had no thought for the well-being of the people—they came only to kill and destroy. They were like the wicked shepherds of Israel denounced by Jeremiah and Ezekiel (see commentary on 10:8). Contrasting his own ministry with theirs, Jesus said, I have come that they may have life, and have it to the full. The imagery is that of a shepherd ensuring that his sheep are well cared for and contented.