Many serious things are going on in this world, and we need to be aware of them and prepared for them. But at the same time we need to learn to relax and take things as they come without getting all nervous and upset about them. We need to learn how to enjoy the good life God has provided for us through the death and resurrection of His Son Jesus Christ (SEE JOHN 10:10). In spite of all the troubling things going on around us in the world, our daily confession should be, "This is the day the Lord has made. I will rejoice and be glad in it."
Something we Christians need to do more of is laugh. We tend to be so heavy about everything - our sin, expecting perfection from ourselves, our growth in God, our prayer life, the gifts of the Spirit, and memorizing Bible verses. We carry around such heavy burdens. If we would just laugh a little more - be of good cheer, "cheer up" - we would find that a little bit of laughter makes that load much lighter.
In the world we live in, there isn't a great deal to laugh about so we will need to do it on purpose. It is easy to find plenty to worry about. To be happy, we need to work on it a little. We need to laugh and have a good time. Laughter really is the best medicine!
Be glad in the Lord, and rejoice, ye righteous: and shout for joy, all ye that are upright in heart. (Psalm 32:11 KJV)