John 16:33 reads, "These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world."
What does this mean exactly?
There is a lot of meat in this one verse. But first it needs to be read in context. These words were spoken between the time Judas left the 12 to betray Christ, and Christ and the eleven went to the Garden of Gethsemane. Therefore it was spoken just prior to the sufferings and crucifixion of Christ.
The Lord had a great deal to disclose to the eleven apostles before He was crucified, and there were four great truths that they needed to hear in this verse:
1. "That in ME ye might have peace".
2. "In the world ye SHALL have tribulation".
3. "But BE OF GOOD CHEER"
4. "I have OVERCOME the world"
These truths are not limited to the apostles but have universal application to all born-again believers:
1. It is only in Christ that a sinner can have peace -- first peace WITH God through the remission of sins, and then the peace OF God which passes all understanding. A Christian can be at peace under the most stressful circumstances because Christ is in him, and he is in Christ. We have peace because we are in God's hands.
2. Every believer's faith will be tested, therefore we all will go through afflictions, trials, tribulations and persecutions. Therefore tribulation is guaranteed to the genuine Christian.
3. Since "The joy of the Lord is your strength" (Neh 8:10) every Christian can also have joy (not happiness but rejoicing in the Lord and the power of His might) in the midst of tribulations.
4. Christ overcame the world, the flesh and the devil through His own battle with Satan, and on the Cross and in His resurrection, He destroyed the power of sin, Hell, death, Hades, and Satan. When a believer "reckons" himself dead to sin and alive to God, he too overcomes the world. But it is always in and through Christ, by the power of the Holy Spirit.