A pilot runs the same checklist on the four-hundredth flight as on the first. Confidence isn't the absence of the checklist. It's the calm that comes from having one.
Belief works better as a baseline than as a summit. Baselines dip, for weather and bad news and a rough conversation, and a dip isn't the loss of the thing.
You know it's normal when you've stopped noticing it, the way you don't notice knowing how to type until someone asks you to look at your hands.