What does John 7:29 mean?

Jesus has previously pointed out that those who reject Him have all the information they need. This includes the writings of Moses and the other prophets. It includes Israel's status as God's chosen people (John 5:45–47). It even includes the miracles Jesus has performed (John 5:36), and the testimony of others (John 5:33). Those who won't come to Christ do so because they have no intention of doing so (John 5:39–40). Their disobedience leads to a lack of understanding (John 7:17). As a result, even though Jesus is delivering the message of God, and comes from God, and is God (John 1:1), He is not accepted, even by members of His own family (John 7:1–9).

The reactions to Jesus' preaching in this passage are mixed. The religious leaders have already made up their minds to kill Jesus (John 5:18), and will soon make another attempt to have Him arrested. Some think Jesus is crazy (John 7:20), others wonder about His ministry (John 7:12–13). Some, despite all the controversy, are willing to follow the evidence exactly where it leads: to belief (John 7:31).