What does John 16:33 mean?

Christ's words, recorded here, are among the most cherished in the gospel of John. This statement combines teaching, remembrance, warning, and encouragement. Becoming a Christian does not guarantee an easy life. In fact, Jesus has made it clear that following Him can lead to persecution (John 16:1–4). The joy held by born-again believers comes from knowing that Christ has already obtained ultimate victory, and nothing in this world can undo that (Romans 8:38–39). That Christ made it clear, in advance, that hard times will come (John 15:20–21) should reassure believers: these situations do not take God by surprise.

Several times during the Last Supper, Jesus has pointed out that He is deliberately giving advance warning (John 13:19; 14:25; 16:4). His explicit purpose for this is encouragement; rather than reacting in fear or confusion, Christians should be aware that those experiences are part of God's greater plan. The book of Hebrews, especially chapter 11, celebrates heroes of the faith who chose to "hold fast" and trust in God. That trust, Scripture shows, was well-placed, even if fulfillment of God's promises didn't come until after those believers had passed into eternity.

The "peace" Jesus speaks of is not worldly comfort, or even happiness. This is the confident "rest" (Matthew 11:28–30) believers experience when they set aside anxiety (Matthew 6:25–34), and trust God to work out His will.

As is common in both ancient literature and biblical prophecy, Jesus speaks of something guaranteed by God as if it has already happened. Prior to this Last Supper (John 13:1–5), Christ overcame the temptations of a human life (Hebrews 4:15) and the direct lures of Satan (Matthew 4:1–11). The greater victory, however, will come after His arrest (John 18:1–3) and crucifixion (John 19:18), when He is raised from the dead (John 20:19).

This final statement of confidence leads into one of the holiest portions of the Bible: Christ's High Priestly Prayer in chapter 17.