Phillipians 4:4-7 – one of my favorite passages.
From the King James Version BibleGateway.com:
Rejoice in the Lord always: and again I say, Rejoice.
Let your moderation be known unto all men. The Lord is at hand.
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
Another version from The Message BibleGateway.com:
Celebrate God all day, every day. I mean, revel in him! Make it as clear as you can to all you meet that you’re on their side, working with them and not against them. Help them see that the Master is about to arrive. He could show up any minute!
Don’t fret or worry. Instead of worrying, pray. Let petitions and praises shape your worries into prayers, letting God know your concerns. Before you know it, a sense of God’s wholeness, everything coming together for good, will come and settle you down. It’s wonderful what happens when Christ displaces worry at the center of your life.