i’m going to have a great day at work today

Saying it on the way in does not arrange the day, but it does arrange the first ten minutes, and the first ten minutes have a strange amount of say over the rest. Who you greet. Whether the difficult task gets opened or postponed. What tone your first message goes out in.

The remainder will do what it does. Deliveries run late; people are curt for reasons that have nothing to do with you. A good one rarely means an undisturbed one. More often it is three or four decent moments and nothing that went badly wrong, noticed on the way home rather than promised on the way in.