What does Mark 14:10 mean?

For what might be the second time in less than a week, Judas has watched Jesus affirm the decision of a woman to "waste" a year's wages on pouring perfume on Jesus (John 12:1–8; Mark 14:3–9). He'd much rather have put the money in the disciples' treasury so he can steal it later (John 12:6). He doesn't really understand that he is the "son of destruction [or perdition]" (John 17:12), chosen by God to betray Jesus and then perish. This is not to say that God created him explicitly for that purpose. Rather, Judas' personal choices make him the perfect candidate for the job, and so God has placed him in the company of the disciples. It's likely Judas heard that the chief priests and Pharisees are looking for someone who can give them access to Jesus away from the crowds (John 11:57), and he sees his chance. Now, Satan has entered him to help him along in fulfilling his destiny (Luke 22:3).

Judas Iscariot is one of Jesus' original twelve disciples. The origin of "Iscariot" is uncertain. Some scholars associate it with a place in Judea called Kerioth. Others think Judas is a member of the Sicarii, the assassin wing of the Zealots that terrorize Judea. The Sicarii rebel against the hated Roman occupiers by wandering through crowds and killing Roman sympathizers with a sicae, or dagger. The Gospels mention Judas about twenty times—three times in a list of the disciples, all three of which note he will betray Jesus. One is a warning about Judas' betrayal. All the rest come in the context of narrating his treachery.

"Judas" is the Latin form of the Greek translation of the Hebrew "Judah." There are other "Judases" in the Bible besides Judas Iscariot. Jesus' half-brother and the author of the book of Jude is formally Judas (Matthew 13:55). There was also another Judas among the disciples, the son of James, who was also called Thaddaeus (John 14:22). Judas the Galilean rebelled against the Roman census in AD 6 or 7 (Acts 5:37). After Paul met Jesus on the road to Damascus, he recovered in a home owned by a man named Judas (Acts 9:11). Another Christ-follower in the early church named Judas accompanied Paul and Barnabas to Antioch to give the ruling that Gentiles didn't have to be circumcised (Acts 15:22, 31–32).

Many people insist that if God was more real, if He presented Himself in a more obvious way, people would eagerly agree to follow Him. Judas is one of many proofs that this is not true. His personality is perhaps more resistant to Christ than normal, but he spent three years with Jesus, the Son of God, and it did nothing to soften his heart.