Think about a circumstance in your life you'd change if you could. Are you frustrated? Worried? Angry? To experience the freedom of contentment in the midst of it--whether a hardship or unfulfilled desire--you must accept the situation as having been allowed by God, even if He didn't cause it.
In these situations, I often pray, "Lord, I choose to accept this as though it's coming from You. No matter what I see, I'm choosing to look to You." Then I can rest in His omnipotence and the knowledge that I'm a child of the living God. Instead of feeling like a helpless, hopeless victim of my circumstance, I know I'm cared for and guided by my sovereign Father through whatever may come.
The second crucial decision is total submission. This doesn't mean approaching God insincerely and saying, "Well, Lord, I just want to thank You for this! It's all just so sweet, Jesus." No, it's not. Be honest and admit, "This is painful and I don't like it. But I choose to submit to You because You are trustworthy and loving. I'm willing to persevere until You accomplish in me whatever You want. I choose to draw from Your strength for everything I need." My friend, if you make this decision and follow through, your fears will lose their power.
Either you believe Romans 8:28 or you don't. And if you do, you can entrust yourself to the Lord, knowing that He has your best interest at heart, will take care of you, and won't ever leave your side. When you embrace these truths, you'll have no reason to be anxious.