In John 9, Jesus heals a man who was born blind. This healing took place on the Sabbath. the Pharisees were so steeped in their beliefs regarding the Sabbath that it caused them to miss what God was doing through His Son.
To the Pharisees, the man who was responsible for this healing could not be from God because the healing took place on the Sabbath. Because it did not line up with their belief, they missed what God was doing.
Even good beliefs can cause us to miss God as we put all our marbles in our belief bag. As we build on them, our beliefs themselves become our God. Do you think you could have convinced the Pharisees that they did not know God; yet that is exactly what Jesus accused them of. Had they known God, they would known He was from God. But they didn't. Instead they knew their beliefs about Him. So when He came through their town, and what He did did not line up with what they believed, they missed Him.
Their beliefs were so important to them that people were afraid to disagree with them for fear of being put out of the synagogue.
Because this new man in town didn't line up with their beliefs, they bashed Him and looked for reasons to accuse Him. 'We know God spoke to and through Moses, but as for this man, we do not know where He came from.' 'Now that is remarkable. You don't know where He came from, yet He did this for me, and none can do these things if they weren't from God.'
What Christ did was proof of where He came from; proof of the source of all He did. But the beliefs the Pharisees had built their life on, caused them to miss it.
