Did Jesus Use the Word Mystery?

Yes — but only once, and the context is significant. The word mystērion appears on the lips of Jesus in a single passage, recorded in three Synoptic Gospels: Matthew 13:11, Mark 4:11, and Luke 8:10. This rarity raises an interesting question: if the concept of mystery is so central to the New Testament (especially in Paul's letters), why did Jesus Himself use the word so sparingly?

The One Occurrence

The passage is the parable discourse in Mark 4 (and parallels). After telling the parable of the sower, Jesus tells His disciples:

"To you has been given the mystery of the kingdom of God, but for those outside everything is in parables."— Mark 4:11 (ESV)

For a full treatment of this passage, see The Mystery of the Kingdom.

Why Only Once?

Several factors may explain the rarity:

Did Jesus Teach the Concept Without the Word?

Absolutely. Many of Jesus' teachings express the idea of hidden truth being revealed, even without using the word mystērion:

Jesus was the embodiment of the mystery concept even when He did not use the word. Paul later supplied the vocabulary for what Jesus had been doing all along.

From Jesus to Paul

The connection between Jesus' single use of mystērion in Mark 4:11 and Paul's extensive use of the word is one of the most important transitions in New Testament theology. Jesus introduced the idea that the kingdom operates through hidden revelation; Paul expanded this into a full theology of God's plan for the ages. See Paul and the Mystery of God for the development.