Psalm 33:21 - In him our hearts rejoice, for we trust in his holy name (NLT)
Psalm 33 is all about the awesomeness of God. It talks about how he created everything with his word, and how everything is dependent on him. And then it declares that because we trust in his name - in other words, God and everything he stands for - our hearts can rejoice.
When it feels as though things are out of control, remember that everything depends on God, and that he's on your side. Then it's much easier to let your heart rejoice.