John 16:33

I have told you these things, so that in Me you may have peace. In the world you have tribulation and distress and suffering, but be courageous; I have overcome the world.  

We may not be able to control our circumstances, but we can control our attitude. Our attitude and peace go together if we trust the Lord and seek Jesus at all times. Peace means we trust God, who is bigger than the circumstance. If we want to see changes in our lives, focus on Jesus, who has overcome the world.