What does Mark 14:6 mean?

The twelve disciples have followed Jesus for three years. Two days before the crucifixion, they still believe He is the Jewish Messiah (Mark 8:27–30), the Son of Man (Daniel 7:13–14), come to free Israel from Roman rule. When He establishes His kingdom, they will assume positions of power (Mark 10:35–37). By scolding the woman who anoints Jesus, they prove they are still assuming too much.

When John proudly explained how he had tried to shut down a stranger casting out demons in Jesus' name, Jesus reprimanded him for discouraging someone obviously empowered by God (Mark 9:38–41). When the disciples rebuked a group of children come to see Jesus, Jesus became indignant with them for "protecting" Him from those who belonged to Him (Mark 10:13–16).

Now the disciples have arrogantly berated a woman whose every intention is to worship Jesus. Four days earlier, they did the same to Mary of Bethany (John 12:1–8), a woman who ignored social convention to sit at Jesus' feet and learn from Him (Luke 10:38–42). It may be that only the women really understand that Jesus is going to die (Mark 14:8).

After Jesus ascends into heaven and the disciples receive the indwelling of the Holy Spirit (Acts 2:1–4), then they will have the wisdom to know God's heart toward people. Peter will rightfully confront Ananias and Sapphira about their lying (Acts 5:1–11). Peter and John will understand how the power and grace of God are far more important than money (Acts 3:1–10). At this point, however, the disciples are still thinking grand thoughts about their positions as Jesus' close followers and their coming authority (Matthew 19:28). They have not yet learned that worshiping Jesus takes many different forms (Romans 14:4).