In this you greatly rejoice, though now for a little while you may have had to suffer grief in all kinds of trials.
A verse like this can be such a great comfort when you are going through a trial. Notice though two things.
One... We are to be rejoicing in these trials. It isn't a command in this particular passage, but instead, it is spoken like a fact. In other words, if you truly understand who you are in Christ, and what this means for you both now and in eternity, you will be rejoicing, even though you are going through trials now.
Two... Trials are assumed. They are going to happen, and all kinds of trials are going to happen. Being in Christ, being part of God's protection, doesn't mean trials won't come.
Take joy in these words today, not my words... the words of Paul. If you are going through a trial today, remember that these trials are going to happen. You are going to have easy times and you are going to have hard times, but the Spirit is there with you always. And remember who you are in Christ. Read these passages. Find others that talk about what Christ has done for you in order to give you a right stance before God.