And after you have suffered a little while, the God of all grace, who has called you to his eternal glory in Christ, will himself restore, confirm, strengthen, and establish you.
(1 Peter 5:10 ESV)
Because our life on earth is short in comparison to eternity we can see why Peter would say that we suffer a little while. This life, although it seems like a long time is just a blip on the screen when compared with eternity.
But God in his grace has called us to an eternal glory in Christ. This will also fair so much greater than any trials that we face in this life. This glory that we will share in is incomparable to any trials we face in this life.
God lists many promises in this short verse. He will restore, confirm, strengthen, and establish us. Our trials are never in vain and are used to grow us to be more like Christ. That is how we can rejoice in our suffering.
What suffering do you face today and will you face it with joy in the expectation of eternity?