1 Peter 4:12-13

Dear friends, do not be surprised at the fiery ordeal that has come on you to test you, as though something strange were happening to you. But rejoice inasmuch as you participate in the sufferings of Christ, so that you may be overjoyed when his glory is revealed.

Dear friends, do not be surprised at the fiery ordeal that has come on you to test you 
1 Peter 1:6-7  In all this you greatly rejoice, though now for a short time you may have had to suffer grief in all kinds of trials. These have come so that the proven genuineness of your faith--of greater worth than gold, which perishes even though refined by fire--may result in praise, glory and honor when Jesus Christ is revealed. 

But rejoice 
Matthew 5:12  "Rejoice and be glad, because great is your reward in heaven, for in the same way they persecuted the prophets who were before you."
Acts 5:41  The apostles left the Sanhedrin, rejoicing because they had been counted worthy of suffering disgrace for the Name. (Jesus Christ)
2 Corinthians 12:10  That is why, for Christ's sake, I delight in weaknesses, in insults, in hardships, in persecutions, in difficulties. For when I am weak, then I am strong. 
James 1:2-3  Consider it pure joy, my brothers and sisters, whenever you face trials of many kinds, because you know that the testing of your faith produces perseverance.
1 Peter 1:16  However, if you suffer as a Christian, do not be ashamed, but praise God that you bear that name.

inasmuch as you participate in the sufferings of Christ 
2 Corinthians 1:5  For just as we share abundantly in the sufferings of Christ, so also our comfort abounds through Christ.

so that you may be overjoyed when his glory is revealed 
Romans 8:17  Now if we are children, then we are heirs--heirs of God and co-heirs with Christ, if indeed we share in his sufferings in order that we may also share in his glory.
1 Peter 5:1  To the elders among you, I appeal as a fellow elder and a witness of Christ's sufferings who also will share in the glory to be revealed: ...

(parentheses are mine)

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