If you are working on something, about to deliver it, moments from opening the doors, an hour from everybody arriving, a week from the release date, two minutes from getting the results back, and you have butterflies in your stomach, be grateful. You are in a wonderful place. Nerves are God's gift to you, reminding you that your life is not passing you by. Make friends with the butterflies. Welcome them when they come, revel in them, enjoy them, and if they go away, do whatever it takes to put yourself in a position where they return. Better to have a stomach full of butterflies than to feel like your life is passing you by.
-- Rob Bell, How to Be Here, p. 106