Why do I reread a three-sentence email four times before sending?

You write three sentences — maybe 'Sounds good, see you at 3' — and then you read it again. Then again. You check if 'sounds good' sounds too casual, or too eager, or too cold. Fifteen minutes pass. The email had one job: confirm a time. This is the mind doing what it does when unwatched — grabbing a small thing and treating it as large. It is not a flaw in your character. It is a wave, and waves rise and fall on their own unless you feed them. Rereading feeds them. The part of you that notices you've reread four times is not the same part that keeps rereading. That noticing is the witness. It already knows the email is fine. Practice is how you let the witness decide, instead of the mind.