What does John 7:31 mean?
This passage describes a wide variety of opinions about Jesus. Even before He made an appearance at this festival, the people were split over what Jesus' ministry meant (John 7:12).The religious authorities intend to kill Jesus at their first good opportunity (John 5:18). Even though they know more about the Scriptures than anyone else, they reject Christ because they are stubborn (John 5:39–40). Disobedience, not a lack of knowledge, is what prevents these well-educated men from seeing Jesus for who He really is (John 7:17).
Those who are less informed than the Pharisees are still confused. Some look to Jewish traditions which suggest Messiah will be an anonymous figure (John 7:27). Based on this, many think that a common man such as Jesus cannot be the Promised One. This, it seems, includes many members of Jesus' own family (John 7:5).
And then there are those who follow all the evidence exactly where it leads. The gospel of John uses the term "signs" in reference to the miracles Jesus performs to prove Himself (John 20:30–31). These are specifically mentioned by Christ as one of the reasons people ought to accept His words (John 5:36). As shown here, some of the people look at the miraculous works of Jesus in the same way Nicodemus did in chapter 3 (John 3:1–2); how could someone do more than this—isn't that enough to prove He is the Christ?