What does John 2:24 mean?

As God incarnate (John 1:1, 14; Hebrews 1:4–6), Jesus had supernatural wisdom of other people's hearts and minds. He knew many of them were only interested in entertainment. Jesus was careful not to "entrust" Himself to the people in the sense that He didn't deeply explain His ministry or mission, as He would do for others (Matthew 13:10–11; Mark 4:10–12). Jesus' conversations with the Pharisees and His miracles certainly provided a good show. Over time, people would fall away as they realized that fireworks were not the main purpose of Christ's ministry (John 6:60–66). God doesn't perform wonders simply to keep us amused (Matthew 12:39).

Some claim only a miracle will make them believe; it's almost certain they won't believe even if they see one (Luke 16:30–31). Simple intellectual belief is not identical to trust, which is the essence of saving faith (Ephesians 2:1–10; Hebrews 11:1). The gospel requires each person to submit to Christ's Lordship (Romans 10:9), not merely admit that He exists (James 2:19). It's likely the unspecified signs (John 2:23) are what inspired Nicodemus to seek Jesus out, as described later (John 3:1–2). He knew that true miracles were messages from God (Luke 9:41–43; John 11:43–44). Only someone bringing God's message could do the things Christ did.