You stop and re-read it again.
You think it over in your head.
In the mouth of your mind you feel the words on your lips and tongue, as if you were saying them out loud.
Sentences can be simple and elegant, complex and artful, and the good ones can make you salivate as you think about saying them.
This article touches on that experience, and does so in a way that honors the subject.
The comments have some great examples, including many of my favourites.