Because I know that this world is not all there is. I know that life is short, but eternity is long, so I'm working on taking care of eternity and letting the world take care of itself. I know that Somebody else is in charge, and that His hand is on the steering wheel, not mine.
I'm not talking about some Panglossian "best of all possible worlds" here. There are going to be hard times coming, harder than any of us expect. From this brief moment of calm before the storm breaks over us, I can see that the troubles will come, and that they will pass. My prayer is that I can keep that vision when the winds rise and my vision is obscured by doubt. I have to remember that my life is not mine to do with as I will anymore. I've given it to my God, to do with as He Wills, and that makes everything different.
I've offered myself as a servant, and so far I've done a pretty poor job of it. Fortunately, God does give on the job training to those of us who are slow learners at times, so I know through His grace, I will get better as time passes.
From this place, everything that happens, good or bad, is training for the next thing.
God tells us through Jeremiah:
For I know the plans I have for you, declares the Lord, plans for wholeness and not for evil, to give you a future and a hope
My future and my hope is in heaven, so everything that God plans for me is to get me to that future.
So this will be a good year.